100 TNPSC Chemistry question & answer
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List of TNPSC Chemistry MCQs
A list of 100 TNPSC Chemistry questions and answers is given below.
1. If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by (a) Mercury (b) Lead (c) Iron (d) Arsenic Ans-b 2. The most important ore of lead is (a) Galena (b) Magnetite (c) Pyrolusite (d) Siderite Ans-a 3. White phosphorus is always kept under (a) benzene (b) kerosene (c) ether (d) water Ans-d 4. Which of the following is not a greenhouse gas? (a) Hydrogen (b) Carbon dioxide (c) Nitric oxide (d) Chlorofluorocarbon Ans-a 5. Polythene is polymer of (a) Ethylene (b) Propylene (c) Acetylene (d) Aniline Ans-a 6. Which is the purest form of iron? (a) Steel (b) Cast iron (c) Pig iron (d) Wrought iron Ans-d 7. The major harmful gas emitted by automobile vehicles which causes air pollution is (a) Carbon Monoxide (b) Methane (c) Carbon dioxide (d) Ozone gas Ans-a 8. Which of the following is a percooled liquid? (a) Ice Cream (b) Teflon (c) Glass (d) Mercury Ans-c 9. Galvanised iron is made by coating iron with (a) Zinc (b) Nickel (c) Chromium (d) Sulphur Ans-a 10. Which among the following metals provides amphoteric oxide? (a) Sodium (b) Silver (c) Aluminium (d) Calcium Ans-c 11. By which organic compound all the oils are known? (a) Carbohydrate (b) Protein (c) Hydrocarbon (d) Ester Ans-c 12. Soap is prepared by boil caustic soda with (a) Alcohol (b) Kerosene (c) Glycerine (d) Fats Ans-d 13. Which of the following gases is mixed with oxygen for breathing by divers in aqualungs? (a) Methane (b) Nitrogen (c) Helium (d) Hydrogen Ans-b 14. Which of these acids is not organic in origin? (a) Lactic acid (b) Sulphuric acid (c) Citric acid (d) Oxalic acid Ans-b 15. The acid present in red ants is (a) Acetic acid (b) Butyric acid (c) Caproic acid (d) Formic acid Ans-d 16. Which one of the following minerals is found in pure form? (a) Iron (b) Copper (c) Bauxite (d) Manganese Ans-b 17. Which compound will show the highest lattice energy? (a) RbF (b) CsF (c) NaF (d) KF Ans-c 18. Which of the following is used as an antiknocking material? (a) Glyoxal (b) Freon (c) T.E.L. (d) Ethyl alcohol Ans-c 19. Which structure(s) of proteins remain(s) intact during denaturation process? (a) Both secondary and tertiary structures (b) Primary structure only (c) Secondary structure only (d) Tertiary structure only Ans-b 20. Which of the following is a basic amino acid? (a) Serine (b) Alanine (c) Tyrosine (d) Lysine Ans-d 21. The second lightest of all gases is (a) Argon (b) Helium (c) Nitrogen (d) Phosphorus Ans-b 22. Which of the following is the strongest base in aqueous solution? (a) Ethylamine (b) Diethylamine (c) Triethylamine (d) Ammonia Ans-c 23. Which of the following is not a gaseous air pollutant? (a) Oxides of sulphur (b) Oxides of nitrogen (c) Hydrocarbon (d) Smoke Ans-c 24. Peroxyacetyl nitrate is a (a) Acidic dye (b) Plant hormone (c) Vitamin (d) Secondary pollutant Ans-d 25. The gas that causes suffoca on and death when coal or coke is burnt in a closed room is (a) Methane (b) Ethane (c) Carbon monoxide (d) Carbon dioxide Ans-c 26. Stalactites and Stalagmites form due to the precipitation of (a) CaCO3 (b) CaCl2 (c) MgCl2 (d) MgCO3 Ans-a 27. The gas dissolved in water that makes it basic is (a) ammonia (b) sulphur dioxide (c) hydrogen (d) carbon dioxide Ans-a 28. Catalytic converters are generally made from (a) alkaline metals (b) hydrogen (c) transition metals (d) carbon Ans-c 29. Nylon is made up of (a) Polyamide (b) Polyester (c) Polyethylene (d) Polypropylene Ans-a 30. The quality of petrol is express in terms of (a) Cetane number (b) Gold number (c) Octane number (d) Added unlead compounds Ans-c 31. ‘Atomic theory’ of matter was given by (a) Avogadro (b) Dalton (c) Newton (d) Pascal Ans-b 32. The alkaloid naturally found in coffee, cocoa and cola nut is (a) Cocaine (b) Morphine (c) Tannin (d) Caffeine Ans-d 33. The chemical name of baking soda is (a) Sodium carbonate (b) Sodium bicarbonate (c) Sodium chloride (d) Sodium nitrate Ans-b 34. The gas produced in marshy places due to decomposition of vegetation is (a) Carbon monoxide (b) Carbon dioxide (c) Sulphur dioxide (d) Methane Ans-d 35. Who developed the model in atomic structure? (a) Bohr and Rutherford (b) Volta (c) Alfred Nobel (d) Faraday Ans-a 36. Which of the following element is obtained from sea weeds? (a) Iodine (b) Vanadium (c) Argon (d) Sulphur Ans-a 37. The rusting of iron is a/an (a) physical change (b) electrochemical change (c) electrical change (d) None of these Ans-b 38. The orientation of an atomic orbital is governed by (a) principal quantum number (b) magnetic quantum number (c) spin quantum number (d) azimuthal quantum number Ans-b 39. Piped Natural Gas (PNG) is used for (a) Mining (b) Welding (c) Anaesthesia (d) Cooking Ans-d 40. The filter over which sewage is sprinkled is called as (a) Trickling filter (b) Percolating filter (c) Contact bed (d) Intermittent sand filter Ans-a 41. Mixture of chloroxylenol and terpineol acts as (a) antiseptic (b) antipyretic (c) antibiotic (d) analgesic Ans-a 42. Which one pollutes the air of a big city? (a) Copper (b) Chromium (c) Lead (d) Calcium Ans-c 43. Ozone layer is present in (a) Troposphere (b) Ionosphere (c) Stratosphere (d) Exosphere Ans-c 44. Which of the toxic heavy metals is found in modern tannery industries? (a) Nickel (b) Zinc (c) Chromium (d) Lead Ans-c 45. The anode of a dry cell is made up of (a) iron (b) cadmium (c) zinc (d) lead Ans-c 46. Which among the following is liquid non-metal? (a) Mercury (b) Bromine (c) Water (d) Alcohol Ans-b 47. The purest form of iron is (a) cast iron (b) steel (c) pig iron (d) wrought iron Ans-d 48. Sulphuric acid is (a) monobasic (b) dibasic (c) tribasic (d) tetrabasic Ans-b 49. Which is a natural colloid? (a) Sodium chloride (b) Urea (c) Cane-sugar (d) Blood Ans-d 50. The antiseptic compound present in dettol is (a) Iodine (b) Chloroxylenol (c) Biothional (d) Cresol Ans-b 51. Combustion of a candle is a/an (a) photochemical reaction (b) physical change (c) endothermic reaction (d) exothermic reaction Ans-d 52. Most crystals show good cleavage because their atoms, ions or molecules are (a) weakly bonded together (b) strongly bonded together (c) spherically symmetrical (d) arranged in planes Ans-d 53. In a face-centred cubic lattice, a unit cell is shared equally by how many unit cells? (a) 2 (b) 4 (c) 6 (d) 8 Ans-c 54. A solution of potassium bromide is treated with each of the following. Which one would liberate bromine? (a) Hydrogen iodide (b) Sulphur dioxide (c) Chlorine (d) Iodine Ans-c 55. If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that (a) the compound is certainly meso (b) there is no compound in the solvent (c) the compound may be a racemic mixture (d) the compound is certainly a chiral Ans-a 56. Chemically considering digestion is basically (a) anabolism (b) hydrogenation (c) hydrolysis (d) dehydrogenation Ans-c 57. RNA and DNA are chiral molecules, their chirality is due to (a) chiral bases (b) chiral phosphate ester units (c) D-sugar component (d) L-sugar component Ans-c 58. The chemical name of ‘Plaster of Paris’ commonly used for sting broken bones is (a) calcium nitrate (b) calcium sulphate (c) calcium carbonate (d) calcium chloride Ans-b 59. The Refrigerant ‘FREON’ is (a) Calcium Tetra Fluoride (b) Difluoro Dichloro Methane (c) Fluorspar and Felspar (d) Hydrofluosilicic Acid Ans-b 60. The Bhopal tragedy was caused by the gas (a) phosgene (b) carbon monoxide (c) methyl isocyanate (d) chlorine Ans-c 61. Taj Mahal is greatly affected due to (a) Tourists (b) Acid rain (c) Deforestation (d) Sound pollution Ans-b 62. Brass is made of (a) copper and tin (b) tin and lead (c) copper and zinc (d) copper, tin and zinc Ans-c 63. Which one lutes the air of a big city? (a) Copper (b) Chromium (c) Lead (d) Cadmium Ans-c 64. In addition to hydrogen, the other abundant element present on Sun’s surface is (a) Helium (b) Neon (c) Argon (d) Oxygen Ans-a 65. An electric iron has a heating element made of (a) Copper (b) Tungsten (c) Nichrome (d) Zinc Ans-c 66. Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission? (a) Boron (b) Heavy water (c) Uranium (d) Plutonium Ans-a 67. An element that does not occur in nature but can be produced artificially is (a) thorium (b) radium (c) plutonium (d) uranium Ans-c 68. Which one of the following elements exhibits the greatest tendency to lose electrons? (a) Fluorine (b) Lithium (c) Oxygen (d) Zinc Ans-b 69. In electro-refining, the pure metal is deposited on (a) vessel (b) electrolyte (c) cathode (d) anode Ans-c 70. Gypsum is used for improvement of (a) Alkaline soils (b) Saline soils (c) Podzols (d) Acidic soils Ans-b 71. Sulphur dioxide bleaches colouring matter by (a) reduction (b) dehydration (c) decomposition (d) oxidation Ans-a 72. Silicon is a (a) semiconductor (b) insulator (c) nonconductor (d) conductor Ans-a 73. Carborundum is another name of (a) Silicon carbide (b) Silicon oxide (c) Calcium carbide (d) Calcium oxide Ans-a 74. Oxide of sulphur present in the atmosphere are washed down by rains to cause (a) Depletion of fossil fuel reserves (b) Eutrophication in lakes (c) Lowering of pH of soil (d) Industrial smog formation Ans-a 75. The fcc crystal contains how many atoms in each unit cell? (a) 6 (b) 8 (c) 4 (d) 5 Ans-c 76. Ionic solids, with Schottky defects, contain in their structure (a) cation vacancies only (b) cation vacancies and interstitial cations (c) equal number of cation and anion vacancies (d) anion vacancies and interstitial anions Ans-c 77. An ideal solution is formed when its components (a) have no volume change on mixing (b) have no enthalpy change on mixing (c) have both the above characteristics (d) have high solubility Ans-c 78. How enzymes increases the rate of reactions? (a) By lowering activation energy (b) By increasing activation energy (c) By changing equilibrium constant (d) By forming enzyme substrate complex Ans-a 79. Which of the following statement is not correct for nitrogen? (a) Its electronegativity is very high. (b) d-orbitals are available for bonding. (c) It is a typical non-metal. (d) Its molecular size is small Ans-b 80. The bleaching action of chlorine is due to (a) reduction (b) hydrogenation (c) chlorination (d) oxidation Ans-d 81. Which one of the following is employed as a tranquilizer? (a) Naproxen (b) Tetracycline (c) Chlorpheniramine (d) Equanil Ans-d 82. Which one of the following is known as the ‘brown coal’? (a) Anthracite (b) Bituminous (c) Coke (d) Lignite Ans-d 83. The gas used to dilute oxygen for breathing by deep sea divers is (a) Neon (b) Argon (c) Nitrogen (d) Helium Ans-d 84. Iron is extracted from (a) Cinnabar (b) Haematite (c) Bauxite (d) Dolomite Ans-b 85. Bleaching powder is use drinking water as a/an (a) disinfectant (b) antibiotic (c) antiseptic (d) coagula Ans-a 86. Natural rubber is a polymer of (a) Vinyl acetate (b) Propene (c) Isoprene (d) Styrene Ans-c 87. The heaviest naturally occurring element is (a) Mercury (b) Polonium (c) Thorium (d) Uranium Ans-d 88. A solution is (a) a homogeneous mixture of two or more substances (b) a solid dissolved in a liquid (c) a solid dissolved in water (d) a mixture of two liquids Ans-a 89. The wire of flash bulbs is made up of (a) Mg (b) Ba (c) Cu (d) Ag Ans-a 90. Among the following, the one that is not a greenhouse gas is (a) sulphur dioxide (b) nitrous oxide (c) methane (d) ozone Ans-a 91. When Zn converts from melted state to its solid state, it has hcp structure, then find the number of nearest atoms. (a) 6 (b) 8 (c) 12 (d) 4 Ans-c 92. If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur? (a) n-type semiconductor (b) p-type semiconductor (c) Both (a) and (b) (d) None of these Ans-a 93. Which of the following statements about the interstitial compounds is incorrect? (a) They are much harder than the pure metal (b) They have higher melting points than the pure metal (c) They retain metallic conductivity (d) They are chemically reactive Ans-d 94. The oxidation of toluene to benzaldehyde by chromyl chloride is called (a) Etard reaction (b) Riemer–Tiemann reaction (c) Wurtz reaction (d) Cannizzaro’s reaction Ans-a 95. Which of the following compounds can form a zwitter ion? (a) Aniline (b) Acetanilide (c) Benzoic acid (d) Glycine Ans-d 96. Which of the following statements about enzymes is true? (a) Enzymes catalyse chemical reactions by increasing the activation energy. (b) Enzymes are highly specific both in binding chiral substrates and in catalysing their reactions. (c) Enzymes lack in nucleophilic groups. (d) Pepsin is proteolytic enzyme Ans-b 97. Phospholipids are esters of glycerol with (a) three carboxylic acid residues (b) two carboxylic acid residues and one phosphate group (c) one carboxylic acid residue and two phosphate groups (d) three phosphate groups Ans-b 98. Which one of the following is employed as Antihistamine? (a) Chloramphenicol (b) Diphenylhydramine (c) Norethindrone (d) Omeprazole Ans-b 99. Which of the following is a cationic detergent? (a) Sodium lauryl sulphate (b) Sodium stearate (c) Cetyltrimethyl ammonium bromide (d) Sodium dodecylbenzene sulphonate Ans-c 100. Water is not effective in extinguishing a fire caused by petrol because (a) the flame is too hot for water to cool it down (b) water and petrol react chemically (c) water and petrol are miscible with each other (d) water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn Ans-d
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