100 SSC-CGL Chemistry question & answer
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SSC-CGL Chemistry MCQs
A list of 100 SSC CGL Chemistry questions and answers is given below.
1. Which mineral is the ore aluminium? (a) Haematite (b) Bauxite (c) Magnetite (d) Siderite Ans-b 2. The most reactive among the halogens is (a) Fluorine (b) Chlorine (c) Bromine (d) Iodine Ans-a 3. The National Chemical Laboratory (India) is located in (a) Mumbai (b) Bengaluru (c) Hyderabad (d) Pune Ans-d 4. The fuel used in an atomic reactor is (a) Coal (b) Petrol (c) Combustible gases (d) Uranium Ans-d 5. What is the principal ore of aluminium? (a) Dolomite (b) Copper (c) Lignite (d) Bauxite Ans-d 6. By-product obtained by soap-industry is (a) Caustic soda (b) Glycerol (c) Naphthalene (d) Caustic potash Ans-b 7. Radioactive disintegration of uranium ultimately results in formation of (a) radium (b) thorium (c) polonium (d) lead Ans-d 8. A polymeric substance used to make parachute is (a) Rayon (b) Viscose (c) Cotton (d) Terylene Ans-b 9. The long range potential of nuclear energy in India depends on its reserves of (a) thorium (b) uranium (c) plutonium (d) radium Ans-b 10. Which of the following is chiefly present in LPG (Liquefied Petroleum Gas)? (a) Methane (b) Ethane (c) Propane (d) Butane Ans-d 11. The enzyme that converts glucose to ethyl alcohol is (a) Invertase (b) Maltase (c) Zymase (d) Diastase Ans-c 12. The main constituent of natural gas is (a) methane (b) ethane (c) butane (d) propane Ans-a 13. Quartz is a crystalline form (a) alumina (b) glass (c) silica (d) limestone Ans-c 14. The substance which does not expand on going from liquid state to solid state is (a) water (b) cast-iron (c) aluminium (d) type metal Ans-d 15. Which of the following impair deep blue colour to glass? (a) Cobalt oxide (b) Cupric oxide (c) Ferrous oxide (d) Nickel oxide Ans-d 16. Paper chromatography is an example of (a) adsorption chromatography (b) partition chromatography (c) thin layer chromatography (d) column chromatography Ans-b 17. Which of the following compounds will not undergo Friedel-Crafts reaction easily? (a) Nitrobenzene (b) Toluene (c) Cumene (d) Xylene Ans-a 18. Which one of the following polymers is prepared by condensation polymerisation? (a) Teflon (b) Natural rubber (c) Styrene (d) Nylon-6,6 Ans-d 19. Diazo coupling is useful to prepare some (a) pesticides (b) dyes (c) proteins (d) vitamins Ans-b 20. Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields (a) ethyl propionate (b) ethyl butyrate (c) acetoacetic ester (d) methyl acetoacetate Ans-c 21. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is (a) helium (b) xenon (c) krypton (d) argon Ans-a 22. The most suitable unit for expressing nuclear radius is (a) nanometer (b) fermi (c) angstrom (d) micron Ans-c 23. The number of hydrogen bonds between guanine and cytosine in DNA is (a) 2 (b) 3 (c) 4 (d) 1 Ans-b 24. Which is not an anesthetic agent in surgical operations? (a) Chloroform (b) Ether (c) Nitrous oxide (d) Acetone Ans-d 25. Antacids are found in drugs than give relief to (a) Eye sight (b) Stomachache (c) Acne (d) Headache Ans-b 26. The chemical name of ‘Hypo’ commonly used in photography is (a) Sodium thiosulphate (b) Silver nitrate (c) Sodium nitrate (d) Silver iodide Ans-a 27. In organic compounds, nitrogen is estimated by (a) Carius method (b) Victor-Meyer’s method (c) Liebig’s method (d) Dumas method Ans-d 28. The gas that is used in the manufacture of vanaspati ghee is (a) Oxygen (b) Carbon dioxide (c) Hydrogen (d) Nitrogen Ans-c 29. The two metal ions that cause hardness to water are (a) Calcium, Magnesium (b) Sodium, Calcium (c) Sodium, Potassium (d) Sodium, Magnesium Ans-a 30. The compound obtained by heating a mixture of ethylamine and chloroform with ethanolic potassium hydroxide (KOH) is (a) an amide (b) an amide and nitro compound (c) an ethyl isocyanide (d) an alkyl halide Ans-c 31. Which of the following processes is used for the production of Biodiesel? (a) Transamination (b) Transcription (c) Transesterification (d) Translation Ans-c 32. Acid rain is caused due to pollution of atmosphere by (a) oxides of carbon and nitrogen (b) oxides of nitrogen and sulphur (c) oxides of nitrogen and phosphorous (d) none of these Ans-b 33. Which of the following is correct? (a) Cycloheptane is an aromatic compound (b) Diastase is an enzyme (c) Acetophenone is an ether (d) All of these Ans-b 34. Which of the following hormones contains iodine? (a) Testosterone (b) Adrenaline (c) Thyroxine (d) Insulin Ans-c 35. Phosgene is a common name for (a) phosphoryl chloride (b) thionyl chloride (c) carbon dioxide and phosphine (d) carbonyl chloride Ans-d 36. The number of molecules of ATP produced in the lipid metabolism of a molecule of palmitic acid is (a) 56 (b) 36 (c) 130 (d) 86 Ans-c 37. Purification of aluminium, by electrolytic refining, is known as (a) Hoope’s process (b) Baeyer’s process (c) Hall’s process (d) Serpeck’s process Ans-a 38. Which of the following is not chiral? (a) 2-Hydroxypropanoic acid (b) 2-Butanol (c) 2,3-Dibromopentane (d) 3-Bromopentane Ans-d 39. Hypo is used in photography to (a) reduce AgBr grains to metallic silver (b) convert metallic silver to silver salt (c) remove undecomposed silver bromide as a soluble complex (d) remove reduced silver Ans-c 40. Atoms of different elements have (a) same atomic number and same electronic configuration (b) different atomic number and same electronic configuration (c) different atomic number and different number of valence electrons (d) same number of electrons and neutrons Ans-c 41. Which of the following is a radioactive element? (a) Cobalt (b) Uranium (c) Argon (d) Chromium Ans-b 42. Which one of the following vegetable oils is used in the manufacture of paints? (a) Cottonseed oil (b) Palm oil (c) Sunflower oil (d) Linseed oil Ans-d 43. Dry ice is the solid form of (a) Air (b) Carbon di-oxide (c) Nitrogen (d) Water Ans-b 44. The green colour seen in firework displays is due to the chloride salt of (a) Sodium (b) Strontium (c) Barium (d) Calcium Ans-c 45. Sweat contains water and (a) citric acid (b) lactic acid (c) salt (d) vinegar Ans-c 46. When a bond is formed between two atoms, the energy of the system will (a) increase (b) decrease (c) remain the same (d) may increase or decrease Ans-c 47. Carbon footprint can be reduced in (a) All of these (b) Recycling waste materials (c) Using energy efficient appliances (d) Commuting by public transport Ans-a 48. Bayer’s reagent is (a) Alkaline potassium permanganate (b) Acidified potassium permanganate (c) Hydrogen peroxide (d) Bromine water Ans-a 49. The gas causing acid rain in an industrial area is (a) Carbon dioxide (b) Carbon monoxide (c) Sulphur dioxide (d) Methane Ans-c 50. Stainless steel is an alloy of (a) chromium and carbon (b) chromium, carbon and iron (c) chromium and iron (d) carbon and iron Ans-b 51. Synthetic detergents are made from (a) Sodium stearate (b) Sodium salt of benzene sulphonic acid (c) Sodium salt of benzene carboxylic acid (d) Sodium palmitate Ans-b 52. Uranium eventually decays into a stable isotope of (a) Radium (b) Thorium (c) Lead (d) Polonium Ans-c 53. Burning pyrites ore gives out (a) Carbon dioxide gas (b) Sulphur dioxide gas (c) Nitrogen dioxide gas (d) Nitric oxide gas Ans-b 54. The pair of compounds used as anaesthetic in medicines (a) Ether, Ammonia (b) Nitrous oxide, Chloroform (c) Chloroform, Nitrogen dioxide (d) Nitrogen dioxide, ether Ans-b 55. Which of the following is an iron ore? (a) Bauxite (b) Magnetite (c) Lignite (d) Nitrite Ans-b 56. The function of skimming tank in sewage treatment is to remove (a) oil and fatty substances (b) suspended solids (c) gritty substances (d) inorganic substances Ans-a 57. One of the constituents of tear gas is (a) Ethane (b) Ethanol (c) Ether (d) Chloropicrin Ans-d 58. Which of the following chemical is responsible for depletion ozone layer in the atmosphere (a) Chlorofluorocarbons (b) Nitrous oxide (c) Sulphur dioxide (d) Carbon dioxide Ans-a 59. Why is water not suitable for putting out a petrol fire? (a) The oxygen content of water is isolated by petrol and thus it helps in burning (b) Petrol is too inflammable to be extinguished by water (c) The heat required for combustion of petrol is very low (d) Water, being heavy, slips below petrol which thus remains in contact with air and burns Ans-d 60. Cooking gas is a mixture of (a) methane and ethylene (b) carbon dioxide and oxygen (c) butane and propane (d) carbon monoxide and carbon dioxide Ans-c 61. Exposure to mixtures of chemicals are greater than expected on the basis of effects of exposure to each chemical individually. This is known as (a) Additives (b) Antagonist (c) Synergism (d) Thdepende Ans-c 62. The ore of Aluminium is (a) Fluorspar (b) Bauxite (c) Chalco pyrites (d) Hematite Ans-b 63. The soft silvery metallic element which ionizes easily when heated or exposed to light and is present in atomic clocks is (a) Cerium (b) Cesium (c) Calcium (d) Californium Ans-b 64. A thick paste of cement, sand and water is called (a) Concrete (b) R.C.C. (c) Mortar (d) Kiln Ans-c 65. In deep-sea diving, divers use a mixture of gases consisting of oxygen and (a) hydrogen (b) nitrogen (c) argon (d) helium Ans-b 66. Hydrochloric acid is also known as (a) Gallic acid (b) Picric acid (c) Muriatic acid (d) Chloric acid Ans-c 67. Spontaneous change is one in which there is (a) a lowering of entropy (b) a lowering of free energy (c) increase in free energy (d) an increase in internal energy Ans-b 68. Muddy water is treated with alum in purification process, termed as (a) emulsification (b) absorpt (c) adsorption (d) coagula Ans-d 69. The chemical used for cloud seeding for artificial rains is (a) Silver Nitrate (b) Potassium Bromide (c) Silver Iodide (d) Potassium Nitrate Ans-c 70. Water cycle refers to (a) an integrated attempt to recycle water in relatively arid regions (b) constant movement of water from ocean to land and back to ocean once again (c) scientific management of water in areas excessively plagued with water-logging (d) water distribution in relatively dry areas Ans-b 71. Which of the following statements is false? (a) Artificial silk is derived from cellulose. (b) Nylon-6,6 is an example of elastomer. (c) The repeat unit in natural rubber is isoprene. (d) Both starch and cellulose are polymers of glucose Ans-b 72. Which of the following is responsible for the extra strength of pyrex glass? (a) Potassium Carbonate (b) Lead Oxide (c) Borax (d) Ferric Oxide Ans-c 73. Which of the following is an analgesic? (a) Streptomycin (b) Chloromycetin (c) Novalgin (d) Penicillin Ans-c 74. Which of the following hormones is produced under the conditions of stress which stimulate glycogenolysis in the liver of human beings? (a) Thyroxin (b) Insulin (c) Adrenaline (d) Estradiol Ans-c 75. A is a lighter phenol and B is an aromatic carboxylic acid. Separation of a mixture of A and B can be carried out easily by using a solution of (a) sodium hydroxide (b) sodium sulphate (c) calcium chloride (d) sodium bicarbonate Ans-d 76. When initial concentration of the reactant is doubled, the half-life period of a zero order reaction (a) is halved (b) is doubled (c) is tripled (d) remains unchanged Ans-b 77. Which one of the following statements is not correct? (a) The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium (b) Enzymes catalyse mainly biochemical reactions (c) Coenzymes increase the catalytic activity of enzyme (d) Catalyst does not initiate any reaction Ans-a 78. Which one of the following method is commonly used method for destruction of colloid? (a) Dialysis (b) Condensation (c) Filteration by animal membrane (d) By adding electrolyte Ans-d 79. The method of zone refining of metals is based on the principle of (a) greater mobility of the pure metal than that of the impurity (b) higher melting point of the impurity than that of the pure metal (c) greater noble character of the solid metal than that of the impurity (d) greater solubility of the impurity in the molten state than in the solid Ans-d 80. Antacid tablets consist of (a) hydroxides of sodium, magnesium and aluminium (b) hydroxides of magnesium and aluminium (c) hydroxides of sodium and aluminium (d) hydroxides of magnesium and sodium Ans-b 81. Acid secretion is characteristic of (a) buccal cavity (b) stomach (c) small intestine (d) large intestine Ans-b 82. What will be the longest wavelength line in Balmer series of spectrum? (a) 546 nm (b) 656 nm (c) 566 nm (d) 556 nm Ans-b 83. For azimuthal quantum number l = 3, the maximum number of electrons will be (a) 2 (b) 6 (c) 0 (d) 14 Ans-d 84. Among the following which one has the highest cation to anion size ratio? (a) CsI (b) CsF (c) LiF (d) NaF Ans-b 85. Which one of the following is a greenhouse gas? (a) Nitrogen (b) Helium (c) Carbon dioxide (c) Sulphur dioxide Ans-c 86. Electric fuse is an alloy of (a) tin and lead (b) zinc and lead (c) copper and iron (d) carbon and tin Ans-a 87. Laughing gas is (a) Nitric oxide (b) Nitrous oxide (c) Nitrogen trioxide (d) Nitrogen pentoxide Ans-b 88. Alcohol prepared by the distillation of wood is (a) Propyl alcohol (b) Methyl alcohol (c) Ethyl alcohol (d) Glycerol Ans-b 89. Charcoal is used in water treatment as a/an (a) absorbent (b) coagulant (c) solvent (d) adsorbent Ans-d 90. The dimensions of pressure are the same as that of (a) force per unit volume (b) energy per unit volume (c) force (d) energy Ans-b 91. Which element behaves chemically both as metal and nonmetal? (a) Argon (b) Boron (c) Xenon (d) Carbon Ans-b 92. Which one is formed when sodium phenoxide is heated with ethyl iodide? (a) Phenetole (b) Ethyl phenyl alcohol (c) Phenol (d) None of these Ans-a 93. The alkyl halide is converted into an alcohol by (a) elimination (b) dehydrohalogenation (c) addition (d) substitution Ans-d 94. It is possible to obtain oxygen from air by fractional distillation because (a) oxygen is in a different group of the periodic table from nitrogen (b) oxygen is more reactive than nitrogen (c) oxygen has higher b.pt. than nitrogen (d) oxygen has a lower density than nitrogen Ans-c 95. The correct statement regarding defects in crystalline solids is (a) Frenkel defects decrease the density of crystalline solids (b) Frenkel defect is a dislocation defect (c) Frenkel defect is found in halides of alkaline metals (d) Schottky defects have no effect on the density of crystalline solids Ans-b 96. Green chemistry means such reactions which (a) are related to the depletion of ozone layer (b) study the reactions in plants (c) produce colour during reactions (d) reduce the use and production of hazardous chemicals Ans-d 97. Which of the following is an insulator? (a) Graphite (b) Aluminium (c) Diamond (d) Silicon Ans-c 98. Boron compounds behave as Lewis acids, because of their (a) ionisation property (b) electron deficient nature (c) acidic nature (d) covalent nature Ans-b 99. Which of the following groups of ions makes the water hard? (a) Sodium and bicarbonate (b) Magnesium and chloride (c) Potassium and sulphate (d) Ammonium and chloride Ans-b 100. van der Waals’ real gas, acts as an ideal gas, at which conditions? (a) High temperature, low pressure (b) Low temperature, high pressure (c) High temperature, high pressure (d) Low temperature, low pressure Ans-a
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