1 - The metal used to recover copper from a solution of copper sulphate is
Fe
2 - The first organic compound synthesised in the laboratory was
Glucose
3 - Among the following, carbonate ore of Zinc is
Calamine
4 - The metal used for making aircrafts and rockets is
Nickel
5 - The compound that has the least value for octane number is :
N-heptane
6 - The length of double bond is _______ than single bond.
Shorter
7 - ""Paramagnetism"" is the property of
Unpaired electrons
8 - The structure of NaCl crystal is
Face centered cubic
9 - Which of the following is a renewable source of energy ?
Geothermal power
10 - Gobar gas contains mainly :
Methane
11 - Gobar gas mainly contains
Methane
12 - The main constituent of biogas is
Methane
13 - An example of replenishable energy source is€“
Biomass
14 - Which of the following is used as non-stick coating for cooking utensils?
Teflon
15 - The fibre least prone to catch fire is
Cotton
16 - Which of the following is used to make light weight, but strong plastic ?
Polyvinyl Chloride
17 - Which of the following fibres catches fire least ?
Cotton
18 - Non-stick kitchenwares are coated with
Teflon
19 - Which one of the following minerals is found in Monazite sand ?
Thorium
20 - Which of the following is the main compound of voter ink?
Silver nitrate
21 - The heaviest naturally occurring element is:
Uranium
22 - In which of the following ions , the colour is not due to d-d transition ?
[CrO4]2ˆ’
23 - What is Zeolite?
Hydrated Aluminosilicate
24 - Laughing gas is
Nitrous oxide
25 - Electric fuse is an alloy of
Tin and lead
26 - Detergents used for cleaning clothes and utensils contain
Sulphonates
27 - Which one of the following chemicals helps in fruit ripening?
Ethephon
28 - Which of the following chemicals is used in photography ?
Silver bromide
29 - Atomic number is the number equal to
Protons
30 - Rutherford€™s scattering experiment proved the presence of
Nucleus in atoms
31 - Number of neutrons in an atom of hydrogen is
Zero
32 - The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?
6
33 - An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is
19
34 - Which one of the following contributes largely to the €˜green house effect€™ ?
Water vapour
35 - An important green-house gas other than methane being produced from the agricultural fields is
Nitrous oxide
36 - The gas which is mainly responsible for the green house effect is:
Carbon dioxide
37 - Chernobyl disaster is the result of pollution by
Radioactive waste
38 - €˜Aerosol€™ is known as
Suspended solid particles in air
39 - The percentage of Nitrogen in Air is
78.03
40 - Air is said to be saturated when :
It contains maximum content of water vapour
41 - For extinguishing fire, we use
Carbon Dioxide
42 - Dry powder fire extinguishers contain
Sand and sodium bicarbonate
43 - Dry ice is the solid form of :
Carbon dioxide
44 - Detergents are
Sodium salts of sulphonic acids
45 - The metal compound commonly found in Sindhoor or Kumkum is based on
Lead
46 - Substance used as an anti freeze in radiators of automobiles is :
Methyl alcohol and H2O
47 - Which of the following is used to remove rust stains on cloth?
Oxalic acid solution
48 - Which is not an anasthetic agent in surgical operations?
Acetone
49 - 'Acid rain' is caused due to air pollution by
Nitrous oxide and sulphur dioxide
50 - Gas released during Bhopal tragedy was :
Methyl isocyanate
51 - The filter over which sewage is sprinkled is called as
Trickling filter
52 - Main source of lead pollution is from
Leaded gasoline
53 - An example of major air pollutant is
Carbon monoxide
54 - The nuclear particles which are assumed to hold the nucleons together are
mesons
55 - The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is
3.05 gram
56 - The octane number of zero is assigned to
n-heptane
57 - The metal that is used as a catalyst in the hydrogenation of oils is
Ni
58 - The most abundant rare gas in the atmosphere is
Ar
59 - Maximum permissible concentration of copper in drinking water in mg/L is
1
60 - The amount of chlorine available in water after disinfection is called as
Residual chlorine
61 - Maximum permissible concentration of total hardness in drinking water is
200
62 - Which one of the following is extensively used for sterilizing water ?
Bleaching powder
63 - Assertion (A) : Synthetic detergents can lather when in hard water. Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.
Both A and R is true and R is the correct explanation of A
64 - Which one is the most reactive halogen?
Fluorine
65 - Who first published the periodic table?
Dmitri Mendeleev
66 - The most suitable vessel for storing concentrated sulphuric acid is
Glass vessel
67 - Which one of the following nonmetals shows allotropy in the liquid state?
Sulphur
68 - Sulphuric acid is
Dibasic
69 - The buffer action of blood is due to the presence of
[HCO3]€“ and H2CO3
70 - Bakelite is a co-polymer of Phenol and
Formaldehyde
71 - Which of the following is not an addition polymer?
Nylon
72 - The polymer used in making plastic crockery is
Melamine
73 - The polymerisation of which often following is used in manufacturing of polythene in industry ?
Ethylene
74 - Brass gets discoloured in air due to constant exposure in presence of:
Hydrogen sulphide
75 - Which of the following is not present in German silver?
Silver
76 - Haloarenes are more stable than haloalkanes due to
Resonance effect
77 - The unit of ionic product of water (Kw) is :
Mol2 let-2
78 - Aluminium chloride is
Lewis Acid
79 - Which of the following is not a method of preparing oxygen?
Decomposition of manganese dioxide
80 - Which one of the following statements is not correct? Vulcanisation of rubber makes it
Soft and flexible
81 - The compounds formed when hydrogen combines with p-block elements are called
Molecular hydrides
82 - In vulcanisation process, rubber can be hardened by adding
Sulphur
83 - The substance that is added to make natural rubber strong and more bouncy is
Sulphur
84 - White phosphorus is always kept under
Water
85 - Milk is a colloidal system in which:
Fat is dispersed in water
86 - An emulsion is a colloid of a
Liquid in a liquid
87 - An emulsion is a colloidal solution of
Liquid in liquid
88 - Colloids can be purified by
Dialysis
89 - The tip of the match-stick contains
Red phosphorus
90 - Which of the following is a natural dye ?
Alizarin
91 - Poison used for killing rats is
Zinc phosphide (Zn3P2)
92 - The chemical used in developing photographic films is
Silver bromide
93 - Which one of the following is used as an anti-freeze for the automobile engines ?
Ethylene glycol
94 - A fertile soil is likely to have a pH of
44719
95 - Litmus is obtained from
Lichen
96 - The pH of lemon juice is expected to be
Less than 7
97 - Antacids are found in drugs that give relief to
Stomach ache
98 - The pH of human blood is between
7.5-8
99 - Petroleum is a mixture of
Hydrocarbons
100 - Which of the following contains high content of lead?
High octane fuel
101 - Piped Natural Gas (PNG) is used for
Cooking
102 - Petroleum consists of a mixture of
Hydrocarbons
103 - White coal is
None of these
104 - Which of the following is used to iodise common salt ?
Potassium iodate
105 - A thick paste of cement, sand and water is called
Mortar
106 - What is the most commonly used substance in fluorescent tubes?
Mercury vapour and argon
107 - Tear gas is :
Carbonyl chloride
108 - Tetra ethyle lead (TEL) is
An antiknock compound
109 - The chief source for the production of nitrogeneous fertilizers is :
Ammonia
110 - Which one of the following elements is used in the manufacture of safety matches?
Phosphorus
111 - Zinc sulphide is commonly used as
Rodenticide
112 - Which halide is used in making sensitive emulsion on photograhic film?
Silver bromide
113 - Detergents clean surfaces on the principle of
Surface tension
114 - Which one of the following is not a characteristic feature of alloys?
Homogeneous systems
115 - Galena is a mineral of
Lead
116 - The iron ore which contains 72% of iron is :
Magnetite
117 - Bauxite is an alloy of which of the following metals ?
Aluminium
118 - Hard steel contains
0.5 to 1.5 per cent carbon
119 - Which of the following is not a greenhouse gas ?
Hydrogen
120 - Which is abundant in Gobar gas?
Methane
121 - Concentration of a material which is lethal to 50% animal is called
LD50
122 - The major harmful gas emitted by automobile vehicle which causes air pollution is
Carbon Monoxide
123 - The major harmful gas emitted by automobile vehicles which causes air pollution is
Carbon Monoxide
124 - The element which is used for vulcanizing rubber
Sulphur
125 - Chemically €˜Quick Silver' is known as
Mercury
126 - The weight of 6.023 × 1023 atoms of carbon is
12 gms
127 - If there is one million Mg2+ ions in MgCl2, how many chloride ions are there?
Two million
128 - What is the mass percentage of carbon in carbon dioxide (CO2)?
0.273
129 - Chemical name of bleaching powder is :
Calcium hypochlorite
130 - The chemical formula of the laughing gas is
N2O
131 - The common name for the compound having formal NaOH is
Caustic soda
132 - Philosopher€™s wool is chemically
Zinc oxide
133 - What is the atomic number of Oxygen?
8
134 - Which one of the following metals pollutes the air of a city having large number of automobiles?
Lead
135 - Pollutant from motor car exhaust that causes mental disease is
Lead
136 - The most common cause of pollution of air is
Sulphur dioxide
137 - Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called
Aerosols
138 - Mercury is emitted into air by
Burning garbage
139 - Iron and manganese present as pollutants in water cannot be removed by________
Chlorination
140 - Table salt gets moist during rainy season because
Sodium chloride contains hygroscopic impurities like magnesium chloride
141 - The unit to measure the flow of water is
Cusecs
142 - When water itself combines chemically with some element or mineral it is called
Hydration
143 - Sea water is saltier than rain water because
Rivers wash away salts from earth and pour them into the sea
144 - Spirit in contact with body gives cool sensation because it is :
Highly volatile
145 - Which one is a sublime substance?
Iodine
146 - The biogas used for cooking is a mixture of which of the following?
Methane and carbon dioxide
147 - The major constituent of gobar gas is
Methane
148 - ________ is a by product of sewage treatment and can be decomposed to produce biogas
Sludge
149 - The metal does not give H2 on treatment with dilute HCL is
Ag
150 - The number of g-molecule of oxygen in 6.02 x 1024 CO molecules is
5 gram of molecule
151 - The most extensive, commercially useful source of thorium as monazite sand occurs in India at
Travancore coast
152 - The main active constituent of tea and coffee is
caffeine
153 - The maximum number of isomers for an alkene with molecular formula C4H8 is
4
154 - The first metal used by man was
copper
155 - The hydronium ion is
H3O+
156 - The most electropositive elements among the following is
Cs
157 - The method that cannot be used for removing permanent hardness of water is
boiling
158 - The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
0.01 minute
159 - Which one is a soluble salt in H2O?
CaCl2
160 - Vinegar is ________ .
Diluted formic acid
161 - pH value between 6.5-7.5 makes the soil
None of these
162 - A pungent smell often present near the urinals is due to
Ammonia
163 - Ammonial is a mixture of
Aluminium powder and ammonium nitrate
164 - The heat value of combustion of Gasoline is
47000 kJ/kg
165 - Which one of the following gases has the highest calorific value?
Indane gas
166 - When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in
Emission spectra
167 - If the equilibrium constants for the systems H2 + I2 -> 2HI and 2HI -> H2 + I2 are K1 and K2 respectively, the relationship between K1 and K2 is :
K1= 1/K2
168 - The influence of temperature on reaction rate is predicted by
Arrhenius equation
169 - An example of heterocyclic compound is
Furan
170 - In organic compounds, nitrogen is estimated by
Dumas method
171 - Heavy metals got their name because compared to other atoms they have
Higher atomic masses
172 - Which one of the following elements exhibits the greatest tendency to lose electrons ?
Lithium
173 - Which one is heaviest naturally occurring element of the periodic element?
Uranium
174 - Activated Charcoal is used to remove colouring matter from pure substances by
Adsorption
175 - The molecular mass of a gas is
Twice its vapour pressure
176 - The value of gas constant R in Ergs deg€“1 mole€“1 is
8.314 × 107
177 - The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas
Will increase four-fold
178 - Isobars are lines joining places having equal
Pressure
179 - Which of the following could be used as fuel in propellant or rockets ?
Liquid Hydrogen + Liquid Oxygen
180 - Which gas is used for converting vegetable oils into saturated fats ?
H2
181 - Which of the following gases will effuse out of football bladder most quickly ?
H2
182 - The property of hydrogen which distinguishes it from alkali metals is
Its non-metallic character
183 - Hydrogen is not found in atmosphere because
It is the lightest gas
184 - Which among the following is used as a catalyst in the production of high octane fuels?
H2SO4
185 - Catalytic converters are generally made from :
Transition metals
186 - Which of the following is colourless?
Oxygen
187 - Iodine value is used to estimate
Unsaturation in oil
188 - The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
Helium
189 - Ozone layer of atmosphere absorbs:
Ultraviolet rays
190 - Air shows the property of
Both A and B
191 - The most abundant constituent of atmospheric air is :
Nitrogen
192 - The percentage of oxygen in air is approximately
0.21
193 - The major constituent of air is
Nitrogen
194 - Seaweeds are important source of
Iodine
195 - Sea weeds are important source of
Iodine
196 - The strongest oxidizing agent among the following is:
Fluorine
197 - Helium is added to the oxygen supply of deep sea divers because it is
Less soluble in blood than nitrogen at high pressure
198 - Vulcanization of rubber is carried out by adding
Sulphur
199 - Ozone consists of
Oxygen only
200 - Ozone layer is present in
Stratosphere
201 - The presence of ozone in the stratosphere is responsible for
Checking the penetration of ultraviolet rays to the earth
202 - The major use of sulphur is in the manufacture of
H2SO4
203 - Percentage of lead in lead pencils is
0
204 - Mark the compound which possess ionic, covalent and coordinate bonds.
NH4Cl
205 - The most commonly used chemicals in the artificial rainmaking or cloud seeding are
Silver Iodide (AgI)
206 - Malathion is a/an
Insecticide
207 - The chemical name of rat poison is
Zinc phosphide
208 - Which of the toxic heavy metals is found in modern tannery industries ?
Chromium
209 - The antiseptic compound present in dettol is
chloroxylenol
210 - Cement is usually a mixture of :
Calcium silicate and calcium aluminate
211 - Sodium bicarbonate is commercially known as
Baking soda
212 - Which of the following is the main nitrogenous waste in humans ?
Uric Acid
213 - Quartz is a crystalline form of
Silica
214 - Urea is a
Nitrogenous fertilizer
215 - Removal of carbon particles from air involves the principle of
Electrophoresis
216 - Physico-chemical characteristics of water in water sources undergo changes due to
Effluents
217 - Sulphur dioxide present in the industrial chimney exhaust causes
All of the above
218 - Coating of solid waste with impervious material is known as
Encapsulation
219 - Taj Mahal is greatly affected due to :
Acid rain
220 - Froth floatation process to concentrate the minerals is applicable to
Chalcopyrites
221 - Chemical name of Gammaxane is
Chloro benzene
222 - Epsom salt is used
As purgative
223 - The metal extracted from Bauxite is :
Aluminium
224 - Among the following iron ores, the highest percentage of iron content is found in€“
Haemetite
225 - Natural rubber is the polymer of :
Isoprene
226 - The basic chemical building block of natural rubber obtained from trees is
Isoprene
227 - The name of plastic polymer from which combs, toys, bowls etc., can be made, is
Polystyrene
228 - A polymeric substance used to make parachute is
Viscose
229 - PVC is obtained by the polymerisation of
Vinyl chloride
230 - Water cycle refers to
Constant movement of water from ocean to land and back to ocean once again
231 - Permanent hardness of water may be removed by addition of
Sodium carbonate
232 - Acid rain is caused due to pollution of atmosphere by
Oxides of nitrogen and sulphur
233 - What are the components responsible for acid rain?
Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
234 - Which gas emitted by power stations causes acid rain?
Sulphur dioxide
235 - Which of the following is very reactive and kept in kerosene?
Sodium
236 - Which metal does not undergo corrosion due to the formation of oxide layer?
Aluminium
237 - The wire of flash bulb is made of:
Magnesium
238 - Identify the metal which is non toxic in nature.
Gold
239 - Iron rusts quickly in
Sea water
240 - Which substance is used to retard the setting action of cement?
CaSO4.2H2O
241 - Stalactites and Stalagmites form due to the precipitation of :
CaCO3
242 - Which of the following is not a precious/semi-precious stone?
Pearl
243 - The chemical substance present in bones and teeth is
Calcium phosphate
244 - The chemical substance present in bones and teeth is
Calcium phosphate
245 - In sugar solution,
Sugar is solute, water is solvent
246 - The metallic constituents of hard water are :
Calcium, magnesium and iron
247 - Potassium Permanganate is used for purifying drinking water, because________
It is an oxidising agent
248 - Lead in water can cause
Kidney damage
249 - Hardness of the water is commonly measured in terms of
Calcium carbonate equivalents
250 - The chief source of naphthalene is
Coal-tar
251 - The gas that usually causes explosions in coal mines is
Methane
252 - Submarines move under water. They have engines that run on
Diesel
253 - Which is the highest quality of hard coal?
Anthracite
254 - The main source of Naphthalene is
Coal-tar
255 - In arc welding, Argon is used because of its
Low reactivity with metal
256 - An inert gas mixed with oxygen given to patients suffering from restricted breathing is
Helium
257 - Which of the following elements is obtained from seaweeds ?
Iodine
258 - Silica gel is a
Drying agent
259 - Silicon is a
Semiconductor
260 - The degree of dissociation of an electrolyte depends on
Dilution
261 - In the electroplating of gold, the electrolyte used is
Gold sulphate
262 - The deterioration of a metal by an electrochemical process is commonly termed as
Corrosion
263 - Aqueous solution of which of the following is a good conductor of electricity
Ammonium acetate
264 - The cathode of a lead storage battery is made up of
Lead
265 - Oxide of sulphur present in the atmosphere are washed down by rains to cause :
Depletion of fossil fuel reserves
266 - Supersonic jet causes pollution by thinning of
O3 layer
267 - The pollutant responsible for ozone holes is ________
CFC
268 - Major gaseous pollutant of the thermal power station is
SO2
269 - The gas causing acid rain in an industrial area is
Sulphur dioxide
270 - Sea water can be purified by the process of
Distillation
271 - A mixture of water and alcohol can be separated by
Distillation
272 - Which one is a naturally occuring noble gas?
Argon
273 - Total number of naturally occurring elements
92
274 - The coloured discharge tubes for advertisement mainly contain
Neon
275 - Natural rubber is a polymer of
Isoprene
276 - What is a Bakelite ?
Polymer
277 - What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper ?
There is a violent explosion.
278 - Silver nitrate solution is kept in brown bottles in laboratory because
Brown bottles stops the passage of light through it
279 - Which colour is produce by Arsenic during flame test?
Blue
280 - The natural resource, known as black gold is
Coal
281 - The chief constituent of natural gas is:
Methane
282 - The resources which can be used continuously, year-after-year are called
Renewable
283 - The highest volume of gases in lower atmosphere is comprised of
Nitrogen
284 - What is the maximum Water Vapour content in the atmosphere?
3 to 4 per cent
285 - Which of the process is known as nitrification?
Conversion of ammonia to nitrites
286 - Which is not a green house gas ?
N2O
287 - Formation of ozone hole is maximum over
Antarctica
288 - Ozone saves the biosphere by absorbing high energy radiations called ________ .
Ultraviolet rays (UV)
289 - Which one of the following is not a cause for present global warming and climate change ?
Deforestation
290 - Which one of the following elements is least likely to be found in commercial fertilisers?
Silicon
291 - Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ?
Eutrophication
292 - If the sewage is fully oxidized, the nitrogen is in the form of
Nitrates
293 - If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by
Lead
294 - Extensively used nitrogenous fertilizer is
Urea
295 - What is the atomic number of mercury?
80
296 - Which of the following molecules has a bond order of 2.5?
F2
297 - An element of atomic no. 29 belongs to
D-block
298 - Which metal is the heaviest in periodic table among the following ?
Os
299 - Ruby and sapphire are oxides of
Aluminium
300 - One carat of diamond is equal to
200 mg
301 - Carbon dioxide is
A reducing agent
302 - Hardest allotrope of carbon is
Diamond
303 - Diamond is lustrous because
Its refractive index is high
304 - Dry ice is
Solid carbon dioxide
305 - Yellow Cake an item of smuggling across border is
Uranium oxide
306 - The transuranium elements are the chemical elements with atomic numbers greater than
92
307 - Which of the following elements is non-radioactive ?
Zirconium
308 - Which of the following is used in dating archaeological findings ?
614C
309 - German silver used for making utensils is an alloy of
Copper, zinc, nickel
310 - The coordination number of body centered atom in cubic structure is
8
311 - The product, 9-nitroanthracene is obtained from anthracene by the action of
Nitric acid and acetic anhydride
312 - Cyanide poisoning causes death in seconds because
It causes cardiac arrest
313 - Peroxyacetyl nitrate is a
Secondary pollutant
314 - What is used in storage batteries?
Lead
315 - Match the List-I with List-II and select the correct answer using the codes given below the listsList-I (Green house gas)List-II(Major source)F.Carbondioxide1.Enteric fermentation in cattleG.Methane2.Burning of fossilH.Chloroflro carbons3.Mercury compound
A
316 - Acid rain is caused by
SO2 and NO2
317 - The Bhopal gas tragedy was caused by the gas
Methyl Isocyanate
318 - The Bhopal tragedy was caused by the gas
Methyl isocyanate
319 - Which of the following caused radioactive pollution along the coast of Kerala ?
Thorium
320 - When a spoon is to be electroplated with nickel the spoon is
Made cathode and a pure nickel red, the anode
321 - Conversion of chemical energy into electrical energy occurs in
A battery
322 - The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :
Galvanization
323 - Galvanization of iron is carried out using
Zinc
324 - The working of a dry cell is based on
Electrolysis
325 - The addition of gypsum to portland cement helps in :
Preventing rapid setting of cement
326 - Which gas is most stable at room temperature?
N2
327 - Which of the following is used as a preservative to protect processed food?
Sodium metabisulphite
328 - Chemical composition of cement is
Limestone, Clay and Gypsum
329 - Which one of the following elements is used in the manufacture of fertilizers ?
Potassium
330 - Milk is
Emulsion
331 - Milk is a natural
Emulsion
332 - Emulsifier is an agent which
Stabilizes an emulsion
333 - An emulsifier is an agent which
Stabilises an emulsion
334 - Muddy water is treated with alum in purification process, it is termed as :
Coagulation
335 - Carborundum is another name of
Silicon carbide
336 - German silver is an alloy of
Zinc, copper and nickel
337 - Which one of the following does not contain Silver ?
German Silver
338 - Type metal used in printing press is an alloy of
Lead and antimony
339 - Ultra purification of a metal is done by :
Zone melting
340 - Silicon is used in
All of these
341 - Which of the inert gases can form compounds?
Xenon
342 - Vulcanized rubber contains sulphur
3-5%
343 - Which of the following alloy is used in making magnet ?
Alnico
344 - In its reaction with silver nitrate, C2H2 shows
Acidic property
345 - Major portion of the earth€™s crust is mainly constituted by
Oxygen and Silicon
346 - In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?
Titanium
347 - Name two elements that find wide application in transistor industry.
Silicon and Germanium
348 - Which one is the naturally occuring heaviest element?
Uranium
349 - Which of the following will replace hydrogen from acids to form salts ?
Na
350 - The main component of liquid bleach is:
Sodium hypochlorite
351 - Quartz is made of
Sodium Silicate
352 - What is the product formed when sodium bicarbonate is heated strongly?
Sodium Carbonate
353 - Cement is formed by strongly heating a mixture of
Limestone and clay
354 - Persons working in cement plants and lime stone quarries are prone to disease like
Silicosis
355 - Sodium vapour lamps glow with yellow colour. This is due to
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum
356 - Which amidst the following is not a gem stone ?
Cat's-eye
357 - Calcium salts used as fertilizer is :
Calcium Sulphate
358 - Aluminium salt commonly used to stop bleeding is
Aluminium sulphate
359 - In silvery paints, the main constituent present is
Aluminium powder
360 - Which of the following appeared to be with a significant potential for accumulation through food chains ?
DDT
361 - Higher concentration of nitrogen dioxide in atmosphere air causes
Bronchitis
362 - Which of the following in automobile exhaust can cause cancer?
Polyclinic hydrocarbons
363 - White lung cancer is caused by
Textiles
364 - Which of the following is a man-made source of air pollution ?
Automobile exhaust
365 - Which of the following pollutants is main product of automobile exhaust ?
NO
366 - The smog is essentially caused by the presence of
Oxides of N and S
367 - The depletion in Ozone layer is caused by ________ .
Chlorofluorocarbons
368 - Which of the following is the maximum number of electrons that can be present in M-shell?
18
369 - Atoms of different elements have
Different atomic number and different number of valence electrons
370 - A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
From brown to blue-black
371 - An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :
Battery
372 - The metals commonly used for electroplating are
Chromium, Copper and Nickel
373 - In galvanization, iron is coated with
Zinc
374 - The process of improving the quality of rubber by heating it with sulphur is called
Vulcanization
375 - Which one among the following is not a mixture?
Graphite
376 - The gas used to dilute oxygen for breathing by deep sea divers is:
Helium
377 - The most abundant element in the human body is
Oxygen
378 - The most abundant element in the earth€™s atmosphere is
Nitrogen
379 - Select the one which is not a mixture :
Distilled water
380 - Which of these acids is not organic in origin?
Sulphuric acid
381 - Match the sourc in Column B with the product of Column A. (Product) Column B (Source)A. Formic acid1. LemonB. Citric acid 2. TamarindC. Tartaric acid3. Ants
A B C3 1 2
382 - Saline soil contains
High concentration of salt
383 - Sour milk contains
Lactic acid
384 - Basicity of boric acid, H3BO3 is
2
385 - The substance which does not expand on going from liquid state to solid state is
Type metal
386 - Glycol is added to aviation gasoline because it
Prevents freezing of petrol
387 - Which is the heaviest metal among the following?
Gold
388 - The wire of flash bulbs is made up of
Mg
389 - Which among the following is found in chlorophyll ?
Mg2+
390 - Copper substances when exposed to air gains a green coating due to the formation of:
CuCO3 Cu(OH)2
391 - Browning of paper in old books is caused by
Oxidation of cellulose
392 - Catalyst is a substance which
None of these
393 - When quick lime is added to water
Heat is liberated
394 - What is the element that is in the highest percentage in the composition of the earth ?
Oxygen
395 - The structure of (HPO3)3 is
Cyclic
396 - Spontaneous change is one in which there is:
A lowering of free energy
397 - Which of the following kinds of spectroscopy can provide information on the energy difference between the initial and final states rather the energy levels involved in the transition?
UV photoelectron spectroscopy
398 - When ice cubes are made, the entropy of water
Decreases
399 - Warming ammonium chloride with sodium hydrochloride in a test tube is an example of
Open system
400 - Which of the following partially miscible liquid pairs has both lower and upper critical solution temperature?
Glycerine and m-toluene
401 - The aprotic solvent is
HF
402 - Which of the following has the highest lattice energy?
NaF
403 - Which of the following substance is highly plastic ?
Clay
404 - Soldering of two metals is possible because of the property of :
Cohesion
405 - Which of the following elements is not present in stainless steel?
Tungsten
406 - Which one of the following minerals is found in pure form?
Copper
407 - What is the principal ore of aluminium ?
Bauxite
408 - Burning pyrites ore gives out
Sulphur dioxide gas
409 - Which one of the following pairs is not correctly matched?
Haematite : Copper
410 - The substance most commonly used as a food preservative is
Sodium salt of benzoic acid
411 - Curd is sour due to presence of
Lactic acid
412 - Drinking soda is
Acidic
413 - Which of the following has pH value 7?
Pure Water
414 - Muscle fatigue is caused by the accumulation of :
Lactic acid
415 - The main buffer system of the human blood is
H2CO3 - HCO3
416 - The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is
ozone
417 - The most commonly used bleaching agent is
chlorine
418 - The nucleus of a hydrogen atom consists of
1 proton only
419 - The heat required to raise the temperature of body by 1 K is called
thermal capacity
420 - The gas produced in marshy places due to decomposition of vegetation is
Methane
421 - Organic compounds are
Covalent compounds
422 - Vinegar is an aqueous solution of
Acetic acid
423 - Two elements which can form a large number of compounds are
Carbon and Hydrogen
424 - Alcoholic (€“ OH) group can be identified by :
FeCl3Test
425 - Which of the following vitamins is generally excreted by human in urine?
None of these
426 - The presence of Cobalt in Vitamin B12 was established for the first time by
Spectroscopy
427 - What is the second largest component in milk ?
Fat
428 - Which among the following is a carbohydrate ?
Cane-sugar
429 - How many atoms of oxygen are in a glucose molecule?
6
430 - The common name of sodium bicarbonate is
Baking soda
431 - Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid ?
Methyl orange
432 - Alum stops bleeding in minor cuts because of
Coagulation
433 - The chemical name of 'Hypo' commonly used in photography is
Sodium thiosulphate
434 - Interveinal necrotic spots on leaves appear due to
SO2 injury
435 - The gas used for artificial fruit ripening of green fruit is €“
Ethylene
436 - The natural source of hydrocarbon is
Crude oil
437 - By which organic compound all the oils are known ?
Hydrocarbon
438 - Which of the following elements is found in all organic compounds?
Carbon
439 - Ethanol containing 5% water is known as :
Rectified spirit
440 - An alloy used in making heating elements for electric heating device is
Nichrome
441 - Which of the following is an iron ore ?
Magnetite
442 - The important metal used with iron to produce stainless steel is
Chromium
443 - Which of the following metals form an amalgam with other metals ?
Mercury
444 - ________ gives hardness to stainless steel.
Carbon
445 - When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to
NO2
446 - Wax used for making candle is chemically a mixture of
Aliphatic hydrocarbons
447 - Adding Cl2 to benzene in the presence of AlCl3 is an example of :
Substitution reaction
448 - Benzene cannot undergo :
Elimination
449 - Which one is the simplest aromatic hydrocarbon?
Benzene
450 - Rock salt is a mineral containing
Sodium
451 - Baking soda is :
Sodium bicarbonate
452 - Sodium Carbonate is commonly known as
Washing Soda
453 - Brine refers to :
Salt water
454 - The chemical name of baking soda is
Sodium bicarbonate
455 - Which one of the following group of gases contributes to the 'Green House Effect'?
Carbon dioxide and Methane
456 - Black lung disease occurs in people working in
Coal mines
457 - The least preferred technique in the disposal of Municipal Solid Waste is
Bricketting
458 - Which one of the following was used as a chemical weapon in the first world war ?
Mustard gas
459 - The depletion of ozone layer is due to
Chlorofluorocarbons
460 - Sour taste of lemon is due to the presence of which of the following ?
Citric acid
461 - pH scale ranges from
0 €“ 14
462 - Normal rainwater has a pH level of
5.6
463 - Which one of the following is used as preservative for foodstuff ?
Sodium Benzoate
464 - The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
Sulphuric acid
465 - Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?
Chlorofluorocarbon
466 - Nitrogen fixation is a process of
Conversion of molecular nitrogen to ammonia
467 - Greenhouse effect is caused by
Carbon dioxide
468 - The lowest layer of earth's atmosphere is
Troposphere
469 - Earth€™s atmosphere is an envelope of gases extending to a height of
200 km
470 - The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
oxygen
471 - The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
positional isomerism
472 - The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
44569
473 - The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
4
474 - The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
12 moles of KMnO4
475 - Brass is made of
Copper and zinc
476 - Bridgmanite is
Earth€™s most abundant mineral
477 - Bronze is an alloy of
Copper and Tin
478 - Percentage of carbon in steel ranges from
0.1 to 1.5
479 - Copper is refined by
Roasting
480 - Where does the oxygen that keeps us alive come from?
Water
481 - In chemical terms, what are alums used for purifying water for drinking purposes ?
Double sulphates
482 - Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water.
None of these
483 - If water smells bad, then that odour can be removed by adding
Activated carbon
484 - Surface water is a better source of drinking water because it is poor in
Arsenic
485 - Heavy metal pollution of water is caused by:
Paints
486 - Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
Solar ultraviolet radiation
487 - 'Bhopal gas tragedy' 1984 is related to which gas
Methyl isocyanate
488 - When a nutrient like fertilizer is present in large quantities in a water bodies, plants grow and decay in large numbers because of suffocation of pond that does not leave enough oxygen needed to support life. This type of pollution is called
Eutrophication
489 - Which of the following is the correct sequence of countries in terms of maximum carbon dioxide emission?
China, USA, European Union, India
490 - Normal rainwater is slightly acidic due to the presence of
Carbon dioxide
491 - Global warming is mainly due to accumulation of
Carbon dioxide
492 - Main pollutants released from iron and steel industry are
CO, CO2 and SO2
493 - Which one of the following is a major green house gas?
Carbon dioxide
494 - The 'solid waste' is also known as
Sludge
495 - Periodic table contains how many periods
7
496 - Which one is the lightest element in the periodic table
Hydrogen
497 - Which one of the following is most electronegative?
Carbon
498 - Periodic table contains how many groups
18
499 - Total number of elements in the Periodic table
118
500 - Synthetic detergents are prepared from
Hydrocarbons of petroleum
501 - What is a mixture of potassium nitrate, powdered charcoal and sulphur called?
Gun powder
502 - Iodex, a pain relief balm, has the smell of ________ .
Methyl salicylate
503 - Silver halides are used in photographic plates because they are
Reduced by light
504 - Who developed Hydrogen Bomb?
Edward Teller
505 - Bleaching powder is used in drinking water as a/an
Disinfectant
506 - The process of removing calcium and magnesium from hard water is known as
Water softening
507 - Hard water and soft water can be distinguished by using
Detergent
508 - Which method will be employed to test the hardness of water?
Formation of lather with soap
509 - The purest form of water is
Rain water
510 - The hardest form of carbon is
diamond
511 - The most important ore of aluminium is
bauxite
512 - The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
a condensation reaction
513 - The number of electrons presents in H+ is
zero
514 - The hottest part of the gas flame is known as
luminous zone
515 - Saccharin is made up of
Toluene
516 - The compound to which H2 does not add is
Tetraphenyl ethylene
517 - Which of the following is not a nitrogenous fertilizer ?
Ca(CN)2
518 - The pair of compounds used as anaesthetic in medicines :
Nitrous oxide, Chloroform
519 - Which of the following is used for refrigeration?
Freon
520 - L.P.G. is mostly liquefied
Butane
521 - Which one of the following is not coal variety?
Dolomite
522 - Which of the following is used to increase the anti-knocking property of petrol ?
Tetraethyl lead
523 - The quality of petrol is expressed in terms of
Octane number
524 - Which of the following type of coal has the lowest proportion of volatile matter ?
Anthracite
525 - A colloidal system in which a liquid is dispersed in a liquid is called
Emulsion
526 - Which is a natural colloid ?
Blood
527 - Suspension particles have the size between
10€“2 €“ 10€“4 cm
528 - Which of the following acts as best adsorbent?
Activated Coconut Charcoal
529 - Gelatin is mostly used in making ice-creams in order to
Stabilise the colloid and prevent crystallisation
530 - Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes ?
Sodium chloride
531 - Soap is prepared by boiling caustic soda with
Fats
532 - All the four quantum numbers of two electrons in an atom are not the same.' It is the law of €“
Exclusion Principle of Pauli
533 - Which of the following is not a donor atom?
Aluminium
534 - What happens when a chemical bond is formed ?
Energy is always absorbed
535 - Among the following the hardest metal is
Tungsten
536 - What material is used to make electric heater coil ?
Nichrome
537 - Among the following, which is always found in free-state in nature?
Gold
538 - Philosopher€™s Wool is
Zinc oxide
539 - Which of the following metals has least melting point ?
Mercury
540 - Commercial nitric acid is coloured because it contains dissolved :
Nitrogen dioxide
541 - Choose the incorrect statement pertaining to organic compounds
They are not easily combustible
542 - The gas which emits from rice field is
Methane
543 - Ethylene is a ________ molecule.
Nonpolar
544 - The next higher homologue of C6H14 is
C7H16
545 - In an oxygen molecule, two atoms are united by
Two bonds
546 - How many electrons are there in a Hydrogen atom?
One
547 - The third shell of an atom can have a maximum of ______ electrons.
18
548 - Who developed the model of atomic structure ?
Bohr and Rutherford
549 - Which among the following is a covalent compound ?
Carbon tetrachloride
550 - Gold dissolves in
Aqua regia
551 - Nitric acid does not react with
Gold
552 - Nitrogen in water is commonly found in the form of
Nitrite
553 - Aquaregia is a mixture of the following in the ratio 1 : 3 by volume
Conc. HNO3 and conc. HCl
554 - One of the following is used to dissolve noble metals. That is
Aqua regia
555 - Aspirin is
Acetyl Salicilic acid
556 - Aspirin is common name of
Acetyl Salicylic Acid
557 - By-product obtained by soap industry is
Glycerol
558 - Chloroform can be used as
Anaesthetic
559 - Soap helps in better cleaning of clothes because
It reduces the surface tension of solution
560 - Rusting of iron takes place due to
Oxidation
561 - Combustion of a candle is a/an
Exothermic reaction
562 - Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ?
Butane
563 - Candle is a mixture of
Paraffin was and stearic acid
564 - Coal is formed from
Compressed and hardened biomass
565 - Which one of the following forms of phosphorus is most reactive?
White phosphorus
566 - Limestone is a raw material used by which industry?
Cement
567 - The element absorbed both in cation and anion form is
Nitrogen
568 - Cement containing excess amount of lime
Becomes more strong
569 - Commercially, sodium bicarbonate is known as
Baking soda
570 - All isotopes of the same element have ________
The same atomic number but different atomic masses
571 - The fundamental particles present in the nucleus of an atom are
Proton, neutron
572 - J.J. Thomson€™s proposed model of atom is generally called ________ model.
Plum and pudding
573 - What particles move around the nucleus of an atom and are negatively charged?
Electrons
574 - All isotopes of the same element have ______________
The same atomic number but different atomic masses
575 - Mercury is a :
Liquid metal
576 - The lustre of the metals is because of
Reflection of light due to the presence of free electrons
577 - The non-metal found in the liquid state is
Bromine
578 - Which among the following is liquid non-metal ?
Bromine
579 - Metal are good conductors, because
They contain free electrons
580 - The element used in the manufacture of safety matches is
Phosphorous
581 - This group of alumino-silicate minerals is widely used in making electrical insulators
Mica
582 - Commercial Vaseline is derived from
Petroleum
583 - Alum is used as
A purifier for water
584 - Antacid tablets consist of
Hydroxides of magnesium and aluminium
585 - The most important ore of lead is
Galena
586 - Steel contains
0.1 €“ 5% carbon
587 - Which is the purest commercial form of iron ?
Wrought iron
588 - The most abundant metal in the Earth€™s crust is
Aluminium
589 - The ore of Aluminium is
Bauxite
590 - Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?
Hydrogen
591 - When Hydrogen starts burning in air, it produces ?
Water
592 - The gas which turns into liquid at the lowest temperature among the following is
Hydrogen
593 - The gas that is used in the manufacture of vanaspati ghee is :
Hydrogen
594 - Which one of the following metals does not react with water to produce Hydrogen ?
Cadmium
595 - The name of unreactive gas is
Nitrogen
596 - The green colour seen in firework displays is due to the chloride salt of :
Barium
597 - In deep-sea diving, divers use a mixture of gases consisting of oxygen and
Nitrogen
598 - Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?
Sodium
599 - Which of the following is not soluble in water ?
Zinc sulphate
600 - The material used in the manufacture of lead pencil is
Graphite
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