100 RRB-GROUP D Chemistry question & answer
Here we can learn RRB-GROUP D questions and answers for Railway Recruitment Board (RRB) exams, Chemistry questions and answers, this will also help you to score more marks in all competitive exams and entrance exams like UPSC, SSC, IBPS, SBI, NEET,... the questions from the ncert books. It is the best place to learn exam preparation study materials for all exams. Previous year's asked Chemistry questions and answers and also play Chemistry Quiz. This Quiz makes you more interesting. A list of 100 RRB Chemistry questions and answers is given below.
RRB-GROUP D Chemistry MCQs
A list of 100 RRB Chemistry questions and answers is given below.
1. Which type of glass is used for making glass reinforced plastic? (a) Pyrex glass (b) Flint glass (c) Quartz glass (d) Fibre glass Ans-d 2. When water itself combines chemically with some element or mineral it is called (a) Carbonation (b) Desilication (c) Hydration (d) Oxidation Ans-c 3. The noble gas used in radiothorium is (a) neon (b) argon (c) radon (d) xenon Ans-c 4. Which of the following metals form an amalgam with other metals? (a) Lead (b) Tin (c) Zinc (d) Mercury Ans-d 5. The first metal used by a man (a) Copper (b) Silver (c) Bronze (d) Brass Ans-a 6. What is the element that is the highest percentage in composition of the earth? (a) Silicon (b) Oxygen (c) Magnesium (d) Iron Ans-b 7. Which one of the following metals is used to galvanized iron? (a) Copper (b) Lead (c) Zinc (d) Mercury Ans-c 8. Which among the following coal contains 90 per cent of carbon? (a) Anthracite (b) Bitumen (c) Lignite (d) Peat Ans-a 9. What particles move around the nucleus of an atom and are negatively charged? (a) Electrons (b) Protons (c) Positrons (d) Neutrons Ans-a 10. The basic chemical building block of natural rubber obtained from trees is (a) Isoprene (b) Vinyl Chloride (c) Acetylene (d) Neoprene Ans-a 11. Solder is an alloy of (a) lead, zinc (b) copper, lead (c) tin, lead (d) sodium, lead Ans-c 12. Which of the following is used to remove ink and rust stains on cloth? (a) Oxalic acid (b) Alcohol (c) Ether (d) Kerosene oil Ans-a 13. An inert gas mixed with oxygen given to patients suffering from restricted breathing is (a) Helium (b) Krypton (c) Radon (d) Argon Ans-a 14. The main source of Naphthalene (a) charcoal (b) camphor (c) coal-tar (d) diesel Ans-c 15. The common refrigerant in domestic refrigerator is (a) neon (b) oxygen (c) nitrogen (d) freon Ans-d 16. An example of replenishable energy source is (a) coal (b) petroleum (c) lignite (d) biomass Ans-d 17. Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field? (a) K (b) Rb (c) Li (d) Na Ans-c 18. Which of the following can be used as the halide component for Friedel–Crafts reaction? (a) Chlorobenzene (b) Bromobenzene (c) Chloroethene (d) Isopropyl chloride Ans-d 19. The correct statement in respect of protein haemoglobin is that it (a) functions as a catalyst for biological reactions (b) maintains blood sugar level (c) acts as an oxygen carrier in the blood (d) forms antibodies and offers resistance to diseases Ans-c 20. Formalin is an aqueous solution of (a) fluorescein (b) formic acid (c) formaldehyde (d) furfuraldehyde Ans-c 21. Which one of the following do not form oxyacid? (a) Sulphur (b) Chlorine (c) Nitrogen (d) Fluorine Ans-d 22. The most abundant element is (a) Calcium (b) Silicon (c) Oxygen (d) Nitrogen Ans-c 23. Ultra purification of a metal is done by (a) slugging (b) zone melting (c) smelting (d) leaching Ans-b 24. Chile saltpeter is the com name of (a) sodium nitrate (b) potassium nitrite (c) potassium nitrate (d) sodium nitrite Ans-a 25. Citric acid is present in form in (a) tamarind (b) milk (c) apple (d) lemon Ans-d 26. The metal used for making aircrafts and rockets is (a) Lead (b) Aluminium (c) Nickel (d) Copper Ans-c 27. Sulphur dioxide level in the atmosphere can be reduced 1 using (a) more efficient car engines (b) catalytic converters in indus (c) static electricity to attract in factory chimneys (d) low−sulphur fuels Ans-d 28. 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 state, they emit light, which we can observe in (a) Raman spectra (b) Absorption spectra (c) Emission spectra (d) Fluorescence Ans-c 29. Heavy water is so called because it contains (a) heavy isotope of hydrogen (b) heavy isotope of oxygen (c) mole number of hydrogen atoms (d) mole number of oxygen atoms Ans-a 30. The gas used to extinguish fire is (a) neon (b) nitrogen (c) carbon dioxide (d) carbon monoxide Ans-d 31. The moderator used in a nuclear reactor is (a) uranium (b) radium (c) ordinary water (d) graphite Ans-c 32. Which of the following produces highest amount of energy upon oxidation? (a) Protein (b) Fat (c) Glucose (d) An alkane Ans-b 33. Which of the following is as a moderator in nuclear reactors? (a) Thorium (b) Graphite (c) Ordinary water (d) Radium Ans-b 34. Which one of the following contributes largely to the ‘green house effect’? (a) Ozone (b) Carbon monoxide (c) Carbon dioxide (d) Water vapour Ans-d 35. Among the following, the narrow spectrum antibiotic is (a) chloramphenicol (b) penicillin G (c) ampicillin (d) amoxycillin Ans-b 36. The polymer that is used as a substitute for wool in making commercial fibres is (a) melamine (b) nylon-6, 6 (c) polyacrylonitrile (d) buna-N Ans-c 37. Glucose molecule reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of X is (a) two (b) one (c) four (d) three Ans-d 38. Which one of the following can be oxidised to the corresponding carbonyl compound? (a) 2-Hydroxypropane (b) ortho-Nitrophenol (c) Phenol (d) 2-Methyl-2-hydroxypropane Ans-a 39. At the critical micelle concentration (CMC) the surfactant molecules (a) associate (b) dissociate (c) decompose (d) become completely soluble Ans-a 40. Nitrogen is relatively inactive element because (a) its atom has a stable electronic configuration (b) it has low atomic radius (c) its electronegativity is fairly high (d) dissociation energy of its molecule is fairly high Ans-d 41. Which among the following used to dilute oxygen in the cylinders used by divers? (a) Krypton (b) Argon (c) Helium (d) Neon Ans-c 42. The term ‘brown air’ is used for (a) Acid fumes (b) Photochemical smog (c) Sulphurous smog (d) Industrial smog Ans-b 43. Which of the following particles has the dual nature of particle-wave? (a) Electron (b) Meson (c) Proton (d) Neutron Ans-a 44. The acid which fails to liberate carbon dioxide from sodium bicarbonate is (a) Acetic acid (b) Formic acid (c) Carbonic acid (d) Sulphuric acid Ans-d 45. The strongest oxidizing agent among the following is (a) chlorine (b) iodine (c) fluorine (d) oxygen Ans-c 46. Brine refers to (a) Salt water (b) Sweet water (c) Pure water (d) Starch water Ans-a 47. How many bones are there in a newly born infant? (a) 206 (b) 230 (c) 280 (d) 300 Ans-c 48. The percentage of nitrogen in air is (a) 0.94 (b) 0.03 (c) 78.03 (d) 85.02 Ans-c 49. White phosphorus is generally kept under (a) alcohol (b) water (c) glycerine (d) kerosene oil Ans-b 50. The first organic compound synthesized in the laboratory was (a) urea (b) uric acid (c) lactic acid (d) glucose Ans-a 51. Brass gets discoloured in air due to constant exposure in presence of (a) Aluminium phosphide (b) Hydrogen sulphide (c) Hydrogenated wafers (d) Aluminium sulphide Ans-b 52. Ethanol containing 5% water is known as (a) Dilute alcohol (b) Power alcohol (c) Rectified spirit (d) Absolute alcohol Ans-c 53. Which of the following is reactive and kept in kerosene (a) Sodium (b) Potassium (c) Iodine (d) Bromine Ans-a 54. Cement is usually a mixture (a) Calcium silicate and calcium aluminate (b) Calcium silicate and calcium ferrate (c) Calcium aluminate and calcium ferrate (d) Lime stone and silicon dices Ans-a 55. ‘Aerosol’ is (a) suspended solid particles in air (b) pollutant gas, present in air (c) microbes, present in air (d) green house gas present in air Ans-a 56. Which of the following metals causes Itai-Itai disease? (a) Cadmium (b) Chromium (c) Cobalt (d) Copper Ans-a 57. Which of the following is method of preparing oxygen? (a) Electrolysis of water (b) Fractional distillation of water (c) Decomposition of potassium permanganate (d) Decomposition of manganese dioxide Ans-d 58. Which of the following forms cationic micelles above certain concentration? (a) Sodium dodecyl sulphate (b) Sodium acetate (c) Urea (d) Cetyltrimethylammonium bromide Ans-d 59. Which one of the following is employed as a tranquilizer drug? (a) Promethazine (b) Valium (c) Naproxen (d) Mifepriston Ans-b 60. The artificial sweetner stable at cooking temperature and does not provide calories is (a) saccharin (b) aspartame (c) sucralose (d) alitame Ans-c 61. Artificial sweetner which is stable under cold conditions only is (a) saccharine (b) sucralose (c) aspartame (d) alitame Ans-c 62. Which type of fire extinguisher is used for petroleum fire? (a) Foam type (b) Soda acid type (c) Powder type (d) None of these Ans-a 63. The particle required to continue the chain process of Uranium fission is (a) Electron (b) Proton (c) Neutron (d) Positron Ans-c 64. Which of the inert gases can form compounds? (a) Helium (b) Xenon (c) Krypton (d) Argon Ans-b 65. Hard water and soft water can be distinguished by using (a) dilute acid (b) ordinary soap (c) detergent (d) liquid soap Ans-c 66. Chloroform can be used as (a) analgesic (b) anaesthetic (c) antimalarial (d) antibiotic Ans-b 67. The lightest radioactive element is (a) deuterium (b) polonium (c) tritium (d) uranium Ans-c 68. The element absorbed both in cation and anion form is (a) sulphur (b) nitrogen (c) calcium (d) phosphorus Ans-b 69. The non-metal found in the liquid state is (a) bromine (b) nitrogen (c) fluorine (d) chlorine Ans-a 70. Which one of the following is found in Vinegar? (a) Acetic acid (b) Propionic acid (c) Formic acid (d) Butyric acid Ans-a 71. Which of the following metals has least melting point? (a) Gold (b) Silver (c) Mercury (d) Copper Ans-c 72. Salts of which of the following elements provide colours to fireworks? (a) Phosphorus (b) Strontium (c) Barium J (d) Both (b) and (c) Ans-d 73. The mole fraction of the solute in one molal aqueous solution is (a) 0.009 (b) 0.018 (c) 0.027 (d) 0.036 Ans-b 74. Which one is a colligative property? (a) Boiling point (b) Vapour pressure (c) Osmotic pressure (d) Freezing point Ans-c 75. On which of the following properties does the coagulating power of an ion depend? (a) The magnitude of the charge on the ion alone (b) Size of the ion alone (c) Both magnitude and sign of the charge on the ion (d) The sign of charge on the ion alone Ans-c 76. Which is not correct regarding the adsorption of a gas on surface of a solid? (a) On increasing temperature adsorption increases continuously. (b) Enthalpy and entropy change is negative. (c) Adsorption is more for some specific substance. (d) It is a reversible reaction Ans-a 77. Which one of the following characteristics of the transition metals is associated with their catalytic activity? (a) High enthalpy of atomization (b) Paramagnetic behaviour (c) Colour of hydrated ions (d) Variable oxidation states Ans-d 78. Ethyl benzoate can be prepared from benzoic acid by using (a) ethyl alcohol (b) ethyl alcohol and dry HCl (c) ethyl chloride (d) sodium ethoxide Ans-b 79. The secondary structure of a protein refers to (a) regular folding patterns of continuous portions of the polypeptide chain (b) three-dimensional structure, specially the bond between amino acid residues that are distant from each other in the polypeptide chain (c) mainly denatured proteins and structures of prosthetic groups (d) linear sequence of amino acid residues in the polypeptide chain Ans-a 80. In DNA, the complimentary bases are (a) adenine and guanine; thymine and cytosine (b) uracil and adenine; cytosine and guanine (c) adenine and thymine; guanine and cytosine (d) adenine and thymine; guanine and uracil Ans-c 81. Soldering of two metals is possible because of the property of (a) viscosity (b) osmosis (c) cohesion (d) surface tension Ans-c 82. Iron filings can be separated from a heterogeneous mixture using the technique of (a) sublimation (b) magnetization (c) sedimentation (d) evaporation Ans-b 83. The gas liberated in the Bhopal gas tragedy was (a) phenyl isocyanate (b) acetylene (c) ethylene (d) methyl isocyanate Ans-d 84. The common name of sodium bicarbonate is (a) Soda ash (b) Baking soda (c) Soda lime (d) Baking powder Ans-b 85. Organic food is supposed to better for human consume; because (a) it is grown in glass having air tight environment (b) it is grown without the use of chemicals & synthetic pesticides (c) it depends on enemies fertilizers (d) it is too expensive to buy Ans-b 86. The process of improving the quality of rubber by heating it with sulphur is called (a) Vulcanization (b) Acceleration (c) Sulphonation (d) Galvanization Ans-a 87. In a reaction of the type A + B → C + D, one could ensure it to be a first order reaction by (a) increasing the temperature (b) increasing the concentration of a product (c) increasing the concentration of a reactant (d) adding a catalyst Ans-c 88. Which of the following will replace hydrogen from acids to form salts? (a) S (b) Na (c) Ag (d) P Ans-b 89. Chemical name of Gammexane is (a) toluene (b) chloro benzene (c) aniline (d) benzene hexachloride Ans-d 90. Which one of the following contains maximum percentage of carbon? (a) Cast iron (b) Stainless steel (c) Wrought iron (d) High speed steel Ans-a 91. The unit to measure the flow water is (a) Micro Mho (b) Ohm mi (c) Milli curie (d) Cusecs Ans-d 92. The hottest part of the gas flame is known as (a) blue zone (b) non-luminous zone (c) luminous zone (c) dark zone Ans-c 93. Nitrogen is an essential constituent of all (a) fats (b) proteins (c) vitamins (d) carbohydrates Ans-b 94. Which metal is the heaviest in periodic table among the following? (a) Os (b) Pt (c) Pb (d) W Ans-a 95. The effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as (a) Antagonism (b) Independent (c) Additive (d) Synergism Ans-a 96. Chemical name of bleaching powder is (a) Calcium chlorate (b) Calcium hypochlorite (c) Calcium chloro hypochloric (d) Calcium bichloride Ans-b 97. Dry powder fire extinguishers contain (a) sand (b) sand and sodium carbonate (c) sand and potassium carbonate (d) sand and sodium bicarbonate Ans-d 98. Which of the following could not used as fuel in propellant rockets? (a) Liquid Hydrogen + Liquid Nitrogen (b) Liquid Oxygen + Liquid Argon (c) Liquid Nitrogen + Liquid Oxygen (d) Liquid Hydrogen + Liquid Oxygen Ans-d 99. The metals commonly used for electroplating are (a) Gold, Sodium and Chromium (b) Chromium, Copper and Nickel (c) Nickel, Lead and Chromium (d) Gold, Sodium and Potassium Ans-b 100. The degree of dissociation of an electrolyte depends on (a) dilution (b) impurities (c) atmospheric pressure (d) method of dissolution Ans-a
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