1. Two atoms are said to be isotopes if

2. Which one of the following chemical compounds is responsible for the stimulation of tear glands by the onion?
3. The hair dye available in the market contains two bottles, one containing dye and other containing hydrogen peroxide. The bottles are mixed before applying the dye. The function of hydrogen peroxide is
4. Liquid sodium is used for the heat transfer medium in some of nuclear reactor because
5. Consider the following statements I. Photochromic lenses are lenses that darken on exposure to ultraviolet light . II. Photochromic properties is due to embedded microcrystalline of silver chloride in the glass. Which of the statements given above is/are correct?
6. KO2 (Potassium superoxide) is used in oxygen cylinders in space and submarines because it
7. In terms of magnetic properties oxygen belongs to
8. Which one of the following glasses form the basis of re-writable CD and DVD solid-state memory technology?
9. If four balloons A, B, C and D are filled with hydrogen, oxygen, helium and nitrogen gases respectively and left in air, which balloon reaches to the highest distance from the Earth?
10. Consider the following statements I.Hardness of water depends upon its soap consuming power. II.Temporary hardness is due to bicarbonates of magnesium and calcium. III.Permanent hardness of water is due to sulphate and/or chloride of calcium and magnesium. IV. Permanent hardness can be removed by boiling. Which of the statements given above are correct?
11. Natural Opal which is commonly used as gemstones in many countries is mainly
12. Which one of the following compounds is frequently found packed with drying tubes?
13. Consider the following statements I. Acid rain is caused by emission of carbon dioxide, sulphur dioxide and nitrogen oxides. II. The most important gas which leads to acidification is sulphur dioxide. Which of the statements given above is/are correct?
14. Which one of the following pairs of metals is present in the cytochrome-c and chlorophyll respectively?
15. Which one among the following is not a greenhouse gas?
16. Consider the following statements I. Cloud seeding is an attempt to change the amount of precipitation. II. The most common chemicals used for cloud seeding include silver iodide, dry ice and liquid propane. Which of the statements given above is/are correct?
17. 'Freon' used as refrigerants is chemically known as
18. Which one among the following salts causes hardness to the water?
19. Consider the following statements I. Brent Crude is a major trading classification of sweet light crude oil. II. Brent Crude is sourced from the North Sea. III. Brent Crude contains sulphur. Which of the statements given above are correct?
20. Which of the following is used in the industrial manufacture of Vitamin-A?
21. Consider the following statements I. The Carat is a unit of purity for gold alloys. II. 18-Carat gold is 24 parts gold and 6 parts another metal. Which of the statements given above is/are correct?
22. What is the jeweller's rouge?
23. Which of the following statements regarding the property of hard water is/are correct? 1. Temporary hardness, of water is due to the presence of soluble magnesium and calcium hydrogen carbonate. 2. Temporary hardness of ryaier can be removed by boiling. 3. Calgon's method is applied to remove temporary hardness of water. 4. Permanent hardness of water is removed by Clark's method. Select the correct answer using the codes given below
24. Guncotton is used as a propellant or low-order explosive. Chemically the gun cotton is
25. Why hard water does not give lather with soap?
26. What is the purpose of adding baking soda to dough?
27. Consider the following statements I. All the enzymes found in the organisms are protein in nature. II. Enzymes do not need any cofactor to perform their functions. Which of the statements given above is/are correct?
28. Which one of the following is correct? Butter is
29. The bonding between the nitrogenous bases of one strand with another strand of DNA is done by
30. Consider the following statements. I. Probability of finding the electron in the bonding molecular orbital is more than combining atomic orbitals. II. Bonding molecular orbitals are formed when different sign of orbitals are overlapped. Which of the statements given above is/are correct?
31. Many communities put salt on their roads after a snowfall, Why?
32. Consider the following statements I. Pyrex glasses have boron oxide as main constituent besides silica. II. Pyrex glasses have high thermal expansion, thus less vulnerable to cracking from thermal shock. Ill. They are commonly used for reagent bottles, optical components and household cookware. Which of the statements given above is/are correct?
33. Which one of the following is the reason for keeping the chloroform in brown-tinted glass containers?
34. Which one of the following is an element?
35. The rusting of iron nail
36. Consider the following statements I. Fuels with low octane numbers are ideal for diesel engines. II. Use of gasoline with low octane numbers may lead to the problem of engine knocking. Which of the statements given above is/are correct?
37. Which one of the following is not responsible for the global warming?
38. Which one of the following is correct? Setting of plaster of Paris is
39. The animal fats undergo 'auto-oxidation' under ordinary temperature which gives the fats a rancid taste and odour. Which one of the following causes the rancid taste and odour of the fats?
40. Which of the following pairs of chemical compounds has the potential for carbon capturing by chemical process to reduce the global warming?
41. When the fats are reacted with alkali, they form 'soaps'. The type of reaction taking place in the formation of soaps is called
42. Consider the following statements I. Jet fuel is a mixture of a large number of different hydrocarbons. II. Kerosene-type jet fuel (Jet A and Jet A-1) has a carbon number between 8 and 16. III. Naphtha-type jet fuel (including Jet B), has carbon numbers between 5 and 15. Which of the statements given above is/are correct?
43. Which one of the following is involved for desalination of sea water?
44. Which of the following gases in the atmosphere is/are responsible for acid rains? 1. Oxides of sulphur 2. Oxides of nitrogen 3. Oxides of carbon Select the correct answer using the codes given below
45. Which one of the following chemicals released along with domestic wastes has caused the phenomenon of 'Eutrophication' which leads to high productivity of water bodies?
46. Which one of the following oxides is the most abundant in Earth crust?
47. Which one among the following when dissolved in water give hissing sound?
48. Consider the following statements I. Alums are the double salts of sulphates of monovalent and divalent cations. II. Alum is used in the purification of drinking water. Which of the statements given above is/are correct?
49. Which one of the following reactions is responsible for the transformation of inexpensive liquid vegetable fats into commercially important solid fats (e.g. ghee )?
50. Aqua-regia used by alchemist to separate silver and gold is a mixture of
51. Consider the following statements I. CFLs have a life expectancy of 10000 hrs if used 3 hrs per day. II. CFLs help in reducing global warming. III. CFLs contain mercury which is very harmful to living beings. IV. CFLs should -be disposed of properly and recycled. Which of the statements given above are correct?
52. Commercially vulcanisation of rubber involves
53. Which chemical was an important symbol in our struggle for freedom?
54. Why is the meat preserved in the brine solution is not spoil as quickly as fresh meat?
55. Which one of the following is the major component of the 'photochemical smog'?
56. Nail polish remover contains
57. Which one of the following is the important ore of magnesium?
58. Colligative properties are properties of solutions that depend on
59. Consider the following statements I. Hard soaps (common bar soaps) are the sodium salts of fatty acids. II. Soft soaps are the potassium salts of fatty acids and semi-solid in nature. Which of the statements given above is/are correct?
60. Which one of the following pollutants contains in water due to modern agricultural practices lead to 'methemoglobinaemia' when combines with our blood haemoglobin?
61. Vinegar is used as a condiment, and in the pickling of vegetables and other foods. What is the constituent of vinegar?
62. What is the process by which a lipid mass is converted into a number of small droplets?
63. Consider the following statements I. A chalcogenide glass is a glass con-taining sulphur, selenium or tellurium. II. Chalcogenide glass form the basis of re-writable CD and DVD solid-state memory technology. Which of the statements given above is/are correct?
64. Consider the following statements I. Phosgene is a poisonous compound forms from chloroform in the presence of UV-rays and 02. II. It is used for the synthesis of precursor for the poly-urethane polymer. Which of the statements given above is/are correct?
65. What is the role of positive catalyst in a chemical reaction?
66. What type of reaction is carried out by the lipase in the digestion of fats?
67. Which allotropy of carbon is in rigid three-demensional structure?
68. 'Misch metal' is widely used in the manufacture of which of the following?
69. Which one of the following is used to measure the performance of a motor or gasoline, an aviation fuel?
70. The quality of diesel oil for use in diesel engines is determined by the
71. Making of chappathi is based on
72. Consider the following statements I. Dry ice is the solid form of CO,. II. Dry ice is used primarily as a cooling agent. III. Water ice is colder than dry ice. Which of the statements given above is/are correct?
73. As which one of the following, does carbon occur in its purest form in nature?
74. The biological specimens in laboratory are preserved in the glass containing formalin. What is the ''formalin''?
75. Which one among the following metals is used in fireworks to make a brilliant white light?
76. Which one of the following is the softest?
77. In the modern food processing industries, the foodstuffs are found to be preserved in the brine solution. What is the brine solution?
78. Which one of the following is associated with the formation of brown air in traffic congested cities?
79. Which of the following is not a natural polymer?
80. Which one among the following is the natural polymer?
81. Which one of the following is the hardest alkali metal?
82. The ability of geckos which can hang on a glass surface using only one toe and to climb on sheer surfaces has been attributed to the
83. Which one of the following carbohydrates is used for silvering of mirror?
84. A polymer which is used for making ropes and carpet fibres is
85. Which one of the following is used in the preparation of antiseptic solution?
86. Consider the following statements. I. In the titration between weak bases and strong acids, the indicator such as methyl orange is commonly used. II. In the titration between a weak acid and a strong base, the indicator such as phenolphthalein is commonly used. Which of the statements given above is/are correct?
87. Which one of the following compounds was responsible for the epidemic form of disease called 'Minamata Disease'?
88. The gas used in a refrigerator is
89. If a limestone piece is dipped in water, bubbles evolve. The bubbling is due to
90. Which of the following pesticide is applied to the foundation of buildings to prevent termites?
91. Which one among the following agents is added to domestic LPG cylinder to help in the detection of gas leakage?
92. Which one of the following is the metallurgical operation in which a metal is obtained in a fused state?
93. Sodium stearate is a salt and is used
94. Consider the following statements I. Glass wool has tensile strength greater than steel. II. Glass wool is fire powder. III. Glass wool has high electrical conductivity and absorbs moisture. IV. Glass wool is used to prepare fire glass. Which of the statements given above are correct?
95. Which one of the following is used to measure the combustion quality of diesel fuel during compression ignition?
96. Consider the following statements I. One water molecule forms four H-bonds. II. Water has high boiling point due to high dipole moment. Ill. When ice is melt, collapse of structure leads to increase in density. Which of the statements given above is/are correct?
97. Which one of the following reducing agents can also act as an oxidising agent?
98. At the very low temperature, ice forms
99. The light emitted by firefly is due to
100. The flavour of apple is mainly due to which one of the following?
101. How does the'hypo' used in photography?
102. Which one of the following alkali metals is the lightest?
103. Soaps are important cleansing agent and this property is due to their emulsifying action. How does soap enhance the cleansing action?
104. The pure form of carbon is
105. The pungent smell of garlic is due to
106. Consider the following statements. Loss of particle is equivalent to I. increase in one proton only. lI. decrease in one neutron only. Which of the statements given above is/are correct?
107. Consider the following statements I. Sodium thiosulphate is used in both film and photographic paper processing. II. Sodium thiosulphate is used as an antidote to cyanide poisoning. Which of the statements given above is/are correct?
108. Which one among the following is the chief compound used in Pepper spray, a riot control agent?
109. The number of spectral lines when electron jumps from 5th energy level to 2nd energy level state will be
110. Which one of the following is used as an anti-freezer, which effectively depresses the freezing point of water in an automobile?
111. What is 'Agent orange''?
112. A person is weak, sterile and has very poor eyesight. These are the symptoms because of a pollutant
113. Which one of the following enzyme is used to digest gelatine in the process of recovering silver from the photographic film?
114. Consider the following compounds with the reference to constituent of dettol I. Chloroxylenol II. Terpineol Which of the compounds given above is/are correct?
115. The highest temperature can be achieved in which type of furnace?
116. Milk, mayonnaise are the examples of
117. Silicon carbide (SIC) is known as
118. Carbonated beverages such as soft drinks and soda water contains mainly
119. Gold is mainly extracted by
120. Which one among the following polymers is re-synthesised from the naturally occurring polymer?
121. Which one among the following polymers is used to make personal armour such as combat helmets, ballistic face masks, and ballistic vests?
122. Select the correct answer about ''Ajinomoto'' I. It is a tasty powder and makes a great difference to the way of food taste. II. Chemically, it is monosodium glutamate. Ill. It causes the ''kwok's disease'' in man. Which of the following statements given above is/are correct?
123. The polymeric fibre used as a substitute for wool in making synthetic blankets, sweater, etc., is
124. Which bioinsecticide was first developed on commercial scale?
125. Consider the following statements I. Rust is formed by the reaction of iron and oxygen in the presence of water or air moisture. II. In salt water, iron tends to rust more quickly. Which of the statements given above is/are correct?
126. Which one of the following is used as a mordant in dyeing and tanning industry?
127. From which one among the following water source, the water is likely to be contaminated with fluorine?
128. Which of the following is correct for the semiconductor?
129. A pale blue gas with a fish-like odour restores the colour of a blackened lead painting. The gas is also used as rocket fuel. It is
130. In modern days, which one of the following chemical compounds is used for the hair setting in beauty parlour/ salon?
131. Consider the following substances I. Toilet soap II. Toothpaste III. Vinegar IV. Baking soda Which of the substances given above is/are mixture in nature?
132. The role of the calcinations in metallurgical process is
133. What is the role of positive catalyst in chemical reaction?
134. Which one of the following chemicals is commonly used by farmers to destroy weeds?
135. Which one among the following metal ions is essential for erythropoesis in human beings?
136. Consider the following statements I. Generally, diesel engines operate well with a cetane number from 40 to 55. II. Alkyl nitrates (principally 2-ethyl hexyl nitrate) and di-tert-butyl peroxide are used as additives to raise the cetane number. Which of the statements given above is/are correct?
137. Which one of the following consists only the ores of magnesium?
138. The most abundant metal in the Earth's crust is
139. Food wrapped in newspaper is likely to get contaminated with
140. Which one among the following is the commonest amino acid in nature?
141. The bleaching action of chlorine occurs in the presence of
142. Scuba divers are at high risk due to high concentration of dissolved gases while breathing air at high pressure under water. The tanks used by Scuba divers are filled with
143. Which one of the following is not an ore?
144. Which one of the following fatty acids consists only the essential fatty acids?
145. Consider the following statements I. Mustard gas are a class of related cytotoxic and vesicant chemical warfare agents with the ability to form large blisters on the exposed skin and in the lungs. II. Mustard gas is the organic sulphur compound. Which of the statements given above is/are correct?
146. Which one among the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the Periodic Table?
147. Which one of the following petroleum refinery products has the lowest boiling point?
148. Which one of the following has been producing/can produce light by a chemical change?
149. Consider the following statements I. Crude oil is separated into fractions by steam distillation. II. The fractions at the top of the fractionating column have lower boiling points than the fractions at the bottom. III. Lubricating oils, Paraffin wax, Asphalt and tar are boiled at around 400° C. Which of the statements given above is/are correct?
150. Which of the following proteins has structural as well as enzymatic property?
151. Shallow lake with rich organic products are called
152. The ultra pure metal is obtained by
153. Which one among the following chemicals can be used to clean the surface of gold ornaments?
154. The melting points and boiling points of the transition elements are higher than the corresponding s-block elements. Then which one among the following statements is correct?
155. Why hard water does not give lather with soap?
156. One of the occupational health hazards commonly faced by the workers of ceramic, pottery or glass industries is
157. The coil in a heater is made of
158. Which one among the following statements is correct?
159. Which one among the following statement about an atom is not correct?
160. Which one among the following metals is used in fireworks to make a brilliant white light?
161. Sacrificial anode protects Iron or ships, underground pipelines etc. from rusting, a process known as cathodic protection. Which one of the following metals cannot be used as a sacrificial anode?
162. Which of the following gases in the atmosphere is/are responsible for acid rains? (CDS 2013) I. Oxides of sulphur II. Oxides of nitrogen III. Oxides of carbon Select the correct answer using the codes given below
163. Which one among the following would expand the most on being heated?
164. Ethanol mixed petrol is being sold invarious states wef January 1, 2003. The percentage of ethanol in petrol is
165. Which one among the following substances evolved heat when dissolved in water?
166. Contact lenses are made from
167. Consider the following statements I. Washing soda is used as a water softener. II. Saltpeter is used for heat transfer in solar power plants. Which of the statements given above is/are correct?
168. Which one among the following will you put into pure water in order to pass electric current through it?
169. A body is charged negatively. It implies that
170. The pH of fresh groundwater slightly decreases upon exposure to air because
171. The Fehlling's solution is used for the detection of
172. Consider the following substances. I. Cadmium II. Boron Ill. Nickel Which of the substances given above is/are used as controlling rod in nuclear reactor?
173. Which one among the following polymers is used for making bullet-proof material?
174. Consider the following gases I. Water vapour II. Nitrous oxide III. CFC IV. Methane Which of the gases given above are ''Green House Gases (GHGs)''?
175. Which of the following statements in connection with the properties of water is/are correct? 1. Water has higher specific heat in comparison with other liquid. 2. Water has no dipole moment. 3. Water has low heat of vaporisation. Select the correct answer using the codes given below
176. Metal used to make wires for safety fuses must have
177. Consider the following substances I. Heavy Water II. Graphite Which of the substances given above is/are used as a moderator in a nuclear reactor?
178. Which one of the following is used to slow down the speed of the neutrons in the nuclear reactor?
179. To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, What advantage does thorium hold over uranium? 1. Thorium is far more abudant in nature than uranium 2. On the basis of per unit mass of mined mineral, thorium can generate more energy compared to natural uranium. 3. Thorium produces less harmful waste compared to uranium. Which of the statement (s) given above is/are correct?
180. With reference to the usefulness of the by-products of sugar industry, which of the following statements is/are correct? 1. Bagasse can be used as biomass fuel for the generation of energy. 2. Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers. 3. Molasses can be used for the production of ethanol. Select the correct answer using the codes given below.
181. The elements of a group in the periodic table
182. Which one among the following polymers is used for making bullet-proof material?
183. The pH of fresh groundwater slightly decreases upon exposure to air because
184. Which one among the following statements is correct?
185. Which one among the following statement about an atom is not correct?
186. Vermicompost is a/an
187. The bond which is present between water molecules is