Chemistry- Questions and Answers 03
61. Sir Humphry Davy discovered:(a) Helium (b) Hydrogen
(c) Sodium (d) Oxygen
Answer: (c)
62. A natural fertilizer:
(a) Urea (b) Ammonium Nitrate
(c) Compost (d) Ammonium Nitrate
Answer: (c)
63. Which metal is not used as an electromagnet?
(a) Iron (b) Copper
(c) Nickel (d) Cobalt
Answer: (b)
64. Radium is chemically similar to:
(a) Calcium (b) Hydrogen
(c) Helium (d) Iron
Answer: (a)
65. Which is used as eyewash?
(a) Hydrocyanic acid (b) Boric acid
(c) Tannic acid (d) Citric acid
Answer: (b)
66. Commercial Vaseline is derived from :
(a) Plant gums (b) Coaltar
(c) Wool wax (d) Petroleum
Answer: (d)
67. The process involving in making soap is:
(a) Saponification (b) Hydrolysis
(c) Condensation (d) Polymerisation
Answer: (a)
68. Neoprene, a synthetic rubber, is made from:
(a) Dichloroethane (b) 2-Chlorobutadiene
(c) Carboxy- Methyl Cellulose (d) Methanol
Answer: (b)
69. The second most abundant gas in the atmosphere of the Earth:
(a) Oxygen (b) Argon
(c) C02 (d) Hydrogen
Answer: (a)
70. Kerosene was discovered in 1853 by:
(a) Humphrey Dewey (b) Faraday
(c) Kekule (d) Abraham Gesner
Answer: (d)
71. The poisonous gas emitted from the engines of two-wheelers:
(a) Phosgene (b) Chlorine
(c) Carbon Monoxide (d) Methyl Iso Cyanate
Answer: (c)
72. The only substance in that exists in nature in three forms¬ solid, liquid and gas:
(a) Water (b) Coal
(c) Dry ice (d) Urea
Answer: (a)
73. The purest form of water
(a) River water (b) Seawater
(c) Pond water (d) Rainwater
Answer: (d)
74. Element present in DNA and RNA:
(a) Sulphur (b) Iron
(c) Calcium (d) Phosphorus
Answer: (d)
75. The chemical that causes acid rain:
(a) Sulphur dioxide (b) Silver iodide
(c) Silver bromide (d) Ozone
Answer: (a)
76. Which is also known as ‘paraffin oil’?
(a) Petrol (b) Diesel
(c) Kerosene (d) Naphta
Answer: (c)
77. Gottlieb Daimler invented
(a) Petrol engine (b) Diesel engine
(c) Carburettor (d) Jet Engine
Answer: (c)
78. The temperature at which it will continue to bum for at least five seconds after ignition by an open flame is called:
(a) fire point (b) flashpoint
(c) Autoignition point (d) Octane number
Answer: (a)
79. The Basel Convention is related to:
(a) Hazardous Wastes (b) War Prisoners
(c) Nuclear Weapons (d) Drugs
Answer: (a)
80. What is known as ‘king of chemicals’?
(a) Hydrochloric acid (b) Sulphuric acid
(c) Nitric acid (d) Acetic acid
Answer: (b)
81. The acid present in eye lotion:
(a) Citric acid (b) Boric acid
(c) Nitric acid (d) Carbolic acid
Answer: (b)
82. Which vitamin is also known as Ascorbic acid?
(a) Vitamin A (b) Vitamin C
(c) Vitamin D (d) Vitamin E
Answer: (b)
83. The gas used by plants to respire during day time:
(a) C02 (b) Methane
(c) Nitrogen (d) Oxygen
Answer: (d)
84. The gas used in factories to make Soda Water
(a) Carbon Dioxide (b) Ozone
(c) Ammonia (d) Helium
Answer: (a)
85. The second least dense metal:
(a) Potassium (b) Sodium
(c) Aluminium (d) Lithium
Answer: (a)
86. The hardest metal:
(a) iron (b) Iridium
(c) Chromium (d) Tungsten
Answer: (c)
87. Metal that is the best conductor of heat:
(a) Iron (b) Gold
(c) Silver (d) Copper
Answer: (c)
88. Stibnite is the ore of:
(a) Antimony (b) Lead
(c) Tin (d) Zinc
Answer: (a)
89. Ore of chromium:
(a) Chromite (b) Nichrome
(c) Wolfram (d) Sphalerite
Answer: (a)
90. Magnesium silicate is:
(a) Soda ash (b) Quartz
(c) Potash (d) Talc
Answer: (d)
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