As we all know General Knowledge is an important section for any SSC, Railways, Banking or any other govt. exams. All aspirants who are preparing for the examination in 2021 must be well prepare with this section. Here we are providing Most Important Repeated Chemistry Questions for SSC MTS & Other Competitive exam. These Questions are prepared by experts.
Type- MCQs / FAQs
Start where you are. Use what you have. Do what you can. - आर्थर ऐश
100 MOST REPEATED CHEMISTRY QUESTIONS
1. Who discovered the 'Neutrons'?
Ans. J Chadwick [Hydrogen was discovered by - Cavendish]
2. Who discovered the 'Electrons'?
Ans. JJ Thompson [X Rays was discovered by - WC Roentgen]
3. Who discovered the 'Protons'?
Ans. Ernest Rutherford [Atom Bomb discovered by - Otto Hahn]
4. Which gas is used for Anesthesia?
Ans. Xenon
5. Which element is used in making coils for water heaters?
Ans. Nichrome [Tungsten has highest Melting point]
6. Which gases can cause explosion in coal mines?
Ans. Methane (Acetylene - Artificial Ripening of fruits)
7. Which metal was earlier known as 'Wolfram'?
Ans. Tungsten [Milk of Magnesia - Magnesium Hydroxide]
8. Which mineral is also known as 'Fool's Gold'?
Ans. Pyrite (due to resemblance to gold)
9. Which gas is known as 'Laughing Gas'?
Ans. Nitrous Oxide (N₂O) [Slaked Lime - Calcium Hydroxide]
10. The explosion of the crackers is the example of?
Ans. Combustion
11. 'Saltpeter' is another name for?
Ans. Potassium Nitrate [Oil of Vitroil - Sulphuric Acid]
12. What is deposited on iron in the process of Galvanization?
Ans. Zinc
13. Salt is obtained from seawater by which process?
Ans. Evaporation
14. Which is the densest stable element known on Earth?
Ans. Osmium
15. Which inflammatory compound is present in Pepper Spray?
Ans. Capsaicin
16. Which Gas was leaked during Bhopal Gas Tragedy?
Ans. Methyl Isocyanide (Helium - used in Hot Air Balloons)
17. Which is the purest form of Iron?
Ans. Wrought Iron [Iron is 4th most common element on Earth]
18. What is the main constituent of Gobar Gas?
Ans. Methane [Main constituent of Vinegar - Acetic Acid]
19. Which is most required during chain reaction of Uranium?
Ans. Neutron (required in Nuclear Fission)
20. The materials used in solar cells contains?
Ans. Silicon (Most important ore of Aluminium - Bauxite)
21. Which element is used in the manufacturing of safety matches?
Ans. Red Phosphorous (Red Phosphorous is on tip of matchstick)
22. Quartz is a crystalline form of?
Ans. Silica (Quartz is made up of Silicon Phosphate)
23. In Vulcanization process, rubber can be hardened by adding?
Ans. Sulphur
24. Which gas is used in manufacturing Vanaspati from Veg Oil?
Ans. Hydrogen (Radon Gas- used in Radiotherapy)
25. Which is the main constituent of Honey?
Ans. Fructose
26. Ruby and Sapphire are the ores of?
Ans. Aluminium
27. The sour taste of 'Coca-Cola' is due to which substance?
Ans. Phosphoric Acid (Curd is sour due to - Lactic Acid)
28. Which substance is used in making Smoke Bombs?
Ans. Carbon
29. Which chemical is most used in Photography?
Ans. Silver Bromide
30. Litmus is obtained from?
Ans. Lichens
31. The hardest substance available/present on Earth is?
Ans. Diamond
32. The energy of the sun is mainly due to?
Ans. Nuclear Fusion
33. The tear gas used by the police to disperse the mob contains?
Ans. Chlorine (Most Common Bleaching Agent - Chlorine)
34. Supersonic Jets cause pollution by thinning of?
Ans. O3 Layer (Ozone Layer)
35. Who is the father of Modern Chemistry?
Ans. Antoine Lavoisier
36. The acid rain destroys the vegetation because it contains?
Ans. Sulphuric Acid
37. What is the element required for solar energy conversion?
Ans. Silicon
38. What is the chemical name of 'Baking Soda'?
Ans. Sodium Bicarbonate (Carborundum - Silicon Carbide)
39. Which was the 1st metal used by a man?
Ans. Copper
40. Detergents clean surfaces on the principal of?
Ans. Surface Tension
41. Which is the common refrigerant in domestic refrigerator?
Ans. Freon
42. Which acid is used to remove stains and rust stains on cloth?
Ans. Oxalic Acid
43. What is the chemical name of 'Rat Poison'?
Ans. Zinc Sulphide (Sodium Bicarbonate - Baking Soda)
44. Which Noble Gas is not found in Atmosphere?
Ans. Helium and Radon
45. Which element is used for the vulcanization of Rubber?
Ans. Sulphur
46. Which fuel is used in the atomic reactor?
Ans. Uranium
47. Minamata disease is caused from which metal?
Ans. Mercury
48. Where is the National Chemistry Laboratory located in India?
Ans. Pune
49. Indane Gas (LPG Gas) is a mixture of which 2 gases?
Ans. Butane and Propane [Butane is used in Cigarette Lighter]
50. Human Nails are made up of?
Ans. Keratin
51. What is the name for a substance which irritates Lachrymal Gland?
Ans. Tear Gas (also known as Lacrimator)
52. Water has the maximum density at which temperature?
Ans. 4 degree Celsius (39-degree Fahrenheit)
53. Nail Polish remover contains which substance?
Ans. Acetone
54. Which Non-metal is in liquid form in room temperature?
Ans. Bromine
55. White Phosphorus is generally kept under?
Ans. Water
56. Which is the highest quality of Coal?
Ans. Anthracite (also known as Hard Coal)
57. Which is also known as 'Brown Coal'?
Ans. Lignite
58. Which chemical is used to ripen mangoes artificially?
Ans. Calcium Carbide
59. The Depletion of Ozone Layer is due to?
Ans. Chlorofluorocarbons (CFCs)
60. The IC Chip used in a computer is made up of?
Ans. Silicon
61. The element found in the surface of the moon is?
Ans. Titanium
62. A bee sting leaves which acid which causes pain & irritation?
Ans. Methanoic Acid (or Formic Acid)
63. What is the other name of 'Philosopher's Wool'?
Ans. Zinc Oxide [Neoprene - Synthetic Rubber]
64. 'Fire-Fighting Clothes' are made from?
Ans. Asbestos
65. Who invented the modern Periodic Table?
Ans. Mendeleev [Oxygen was discovered by - Carl Scheele]
66. Which type of Fire Extinguisher is used for petroleum fire?
Ans. Foam Type [Gas used in Fire Extinguisher - CO₂]
67. Which is used as a preservative for foodstuff?
Ans. Sodium Benzoate
68. Which chemical substance is present in Bones & Teeth?
Ans. Calcium Phosphate
69. Carbon occurs in nature in the purest form as -
Ans. Diamond
70. Electric Fuse is an alloy of -
Ans. Tin & Lead
71. Ozone Layer is present in which layer of atmosphere?
Ans. Stratosphere
72. The wire of flash bulbs is made up -
Ans. Mg
73. Which Inert Gas is used by deep sea divers?
Ans. Helium
74. Acid Rain is caused due to pollution of atmosphere by -
Ans. Oxides of Nitrogen & Sulphur
75. The working of dry cell is based on -
Ans. Electrolysis
76. Phosphorus is kept in water because -
Ans. Its Ignition temperature is very low
77. Which is the lightest gas in the Periodic table?
Ans. Hydrogen
78. What is the objective of the 'Kyoto Protocol'?
Ans. To reduce Greenhouse Gases
79. The polymer used in making plastic crockery is -
Ans. Melamine
80. What is the % of lead in lead pencils?
Ans. 0% Lead
81. Which is the purest form of water?
Ans. Rain Water
82. The acid present in 'Red Ants' is?
Ans. Formic Acid
83. Galena is the ore of?
Ans. Lead [Magnetite is the ore of - Iron]
84. Zinc Sulphide is commonly known as -
Ans. Rodenticide (used in Rat Poison)
85. The most abundant inert gas in the atmosphere is -
Ans. Argon (0.93%)
86. The natural source of hydrocarbons is -
Ans. Crude Oil
87. Heat Resistant Variety of glass is -
Ans. Flint Glass
88. The ore which is found in abundance in India is -
Ans. Monazite
89. The By-product obtained by soap industry is -
Ans. Glycerol
90. What are the main pollutants of cigarette smoke?
Ans. Carbon Monoxide & Nicotine
91. Uranium eventually decays into a stable isotope of -
Ans. Lead
92. Red Ink is prepared from?
Ans. Eosin
93. In the electrolysis of Gold, which Electrolyte is used?
Ans. Gold Sulphate
94. The fuel used in modern submarines is?
Ans. Nuclear Fuel
95. Which polymer is used for making Bullet-proof materials?
Ans. Polyethylene (Higher grade of Plastic found in Tupperware)
96. How much % of Carbon does Steel contain?
Ans. 0.1-2% of Carbon
97. Which material is used to make Electric Heater Coil?
Ans. Nichrome
98. Ethanol containing 5% water is known as?
Ans. Rectified Spirit
99. The main source of Naphthalene is?
Ans. Coal Tar
100. Commercial Vaseline is derived from?
Ans. Petroleum
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