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You Are On Question Answer Bank SET 1
51. Thechemical used as a fixer in photography is
Answer: sodiumthiosulphate
52. Which ofthe following substance is a bad conductor of electricity but a good conductorof heat?
Answer: Mica
53. Polythene is industrially prepared by the polymerisation of–
Answer: ethylene
54. Talc isbasic –
Answer: silicate mineral
55. Sodium is stored in Kerosene to prevent-
Answer: oxidation.
56. Permanenthardness is due to the presence of sulphates and chlorides of calcium andmagnesium. It can be removed by –
Answer: Addingwashing soda or by
57. NPKmixtures are fertilizers with the mixtures of –
Answer: nitrogen,phosphorous and potassium.
58. The gas responsiblefor the Bhopal Gas Tragedy is –
Answer: MethylIsocyanate (MIC)
59. Thoriumis extracted from –
Answer: monozitesand.
60. Redphosphorus is used in :
Answer: Making matches
61. In a drycell, zinc and carbon act as-
Answer: electrodes.
62. Chlorineis used as a-
Answer: bleaching agent.
63. Lead pencils contain –
Answer: graphite.
64. White phosphorus is a –
Answer: strongpoison.
65. Carborundum is used as an abrasive for-
Answer: cutting and grinding glasses.
66. Silveriodide is used to make –
Answer: artificialrain.
67. Zincoxide is called the-
Answer: "flower of Zinc"
68. Water iscalled –
Answer: "UniversalSolvent"
69. The gasused in refrigerators is-
Answer: ammonia.
70. The lightest substance known is Hydrogenand the heaviest is –
Answer: Osmium.
71. Con.Nitric acid is used to-
Answer: purify gold.
72. Amixture of salt and ice gives a temperature below 0°c which iscalled Antifreeze. It is used to –
Answer: break down ice mixtures in the radiators of cars in cold countries.
73. Neopreneis a synthetic rubber used as insulators in-
Answer: Electric cables.
74. Butane is used in-
Answer: cigarette lights.
75. Amixture of oxygen and acetylene gases are used for-
Answer: gas welding.
76. Methaneis the main component of-
Answer: .
77. Thesmell of cooking gas is due to the Ethyl Mercaptan which helps to-
Answer: detect gas leakage.
78. Alnicois an alloy of aluminium used for-
Answer: making magnets.
79. Duralminis an alloy of aluminium (94%), copper (4%) and Magnesium (1%) used for –
Answer: constructingair crafts.
80. Invar isa nickel -iron alloy used for-
Answer: making clocks.
81. Aspirinor Acetyl salicylic acid is used as a –
Answer: pain killerand it has anti-inflammatory properties.
82. TriNitro Toluene (TNT) is used as an-
Answer: explosive.
83. The mostcommonly used Synthetic rubber is-
Answer: styrene Buta-diene rubber (SBR).
84. Theelectrodes of dry cell is made up of-
Answer: Graphite.
85. Acidrain is caused by the pollution of environment due to-
Answer: nitrogen oxide and sulphur dioxide.
86. The mostchemically active element is-
Answer: Fluorine.
87. Chlorofluro carbon (CFCS) used in refrigerators causes-
Answer: ozone hole formation.
88. Sodium/Potassium salt of stearic acid, palmitic acid and oleic acid is-
Answer: soap.
89. Aquaregia is a mixture of concentrated nitric acid and hydrochloric acid which can dissolve-
Answer: gold and platinum.
90. Coinsare made of coinage alloy which consists of-
Answer: copper and nickel.
91. Colouredglasses for goggles contain-
Answer: ferrous oxide.
92. Coatingof iron with zinc to prevent from rusting, is called-
Answer: galvanisation.
93. Lead isused in petrol as an –
Answer: antiknockingagent.
94. Aquaregia is a mixture of concentrated nitric acid and hydrochloric acid whichcan dissolve-
Answer: gold and platinum.
95. Natural gas predominantly contain
Answer: methane.
96. Liquified Petroleum Gas mainly consists of-
Answer: liquified and isobutane.
97. Ethyleneis used for the artificial ripening of-
Answer: .
98. Gelatineis used in the manufacture of ice cream to-
Answer: prevent crystal growth.
99. Vulcanisation is the process of adding sulphur to rubber to make it-
Answer: strong and bounceable
100. Nonstick kitchenware is coated with-
Answer: teflon (Poly tetra Fluro Ethylene) andpottassium hydrogen tartarate.
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