101 Chemistry General Questions For PSC

In this post, we are sharing a collection of 101 Chemistry General Knowledge questions and answers. Most of these one-liners are often asked in the SSC-CGL, UPSC, NDA, CDS and UPSC, IAS and Kerala PSC exams.

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100 Chemistry General Questions  & Answers

1. Dry ice is – Solid CO₂.
2. Rarest Metal – Rhodium.
3. Lightest Metal – Lithium.
4. Heaviest Metal – Osmium.
5. Hardest Metal – Tungsten.
6. Most Ductile Metal – Gold.
7. Wax is soluble in – Benzene.
8. Dolomite is an ore of – Calcium.
9. Most Precious Metal – Platinum.
10. Cinnabar is the ore of – Mercury.
11. Malleable Metals – Gold & Silver.
12. Steel is an alloy of – Carbon & Tin.
13. Brass is an alloy of – Copper & Zinc.
14. Gas used in welding – Acetylene.
15. Freon gas is used in – Refrigerators.
16. Water has maximum density at – 4°C.
17. Metal with Lowest Density – Lithium.
18. Acid contained in onion – Oxalic acid.
19. Acid used to wash eyes is – Boric acid.
20. Fuse wire is made up of – Lead & Tin.
21. Galvanized Iron is coated with – Zinc.
22. Most Abundant Metal in Earth – Iron.
23. Liquid at room temperature – Gallium.
24. Smallest particle in a substance – Atom.
25. A raincoat is made of – Polychloroethene.
26. Element obtained from sea weeds – Iodine.
27. The Inert gas used as beacon light is – Neon.
28. Diamond is the crystalline form of – Carbon.
29. The gas used to fill the electric bulbs – Argon.
30. Acid present in vegetable oil is – Stearic acid.
31. Acid used to clean ink stains – Oxalic acid.
32. No. of electrons that could fit into an orbit – 2.
33. Chemically heavy water is – Deuterium oxide.
34. Best Conductor of Heat and Electricity – Silver.
35. Acid used in the storage batteries – Sulfuric Acid.
36. Substance that turns blue litmus paper red – Acid.
37. Metal with the Lowest Boiling Point – Helium.
38. Metal with the Highest Boiling Point – Tungsten.
39. Prolonged electrolysis of water gives – Heavy water.
40. Uncertainty Principle is proposed by – Heisnberg.
41. The no. of groups in Mendeleev periodic table – 7.
42. No. of groups in the modern Periodic table is – 18.
43. Most Abundant Metal in Human body – Iron.
44. Methane gas was discovered by – Alexandra Volta.
45. The setting of plaster of Paris involves – Oxidation.
46. Hydrochloric acid is also known as – Muriatic acid.
47. Non-stick cooking utensils are coated with – Teflon.
48. Most commonly used bleaching agent is – Chlorine.
49. Ultra purification of metal is done by – Zone Smelting.
50. The isotope used for the treatment of Cancer – Cobalt 60.
51. Isotopes of Hydrogen – Tritium, Deuterium & Protium.
52. Two main constituents of Granite – Silica & Aluminium.
53. The first organic compound prepared in laboratory – Urea.
54. The most abundant element in the universe is – Hydrogen.
55. The process used to produce Ammonia is – Haber process.
56. Metal used to make the covering of nuclear reactors – Lead.
57. Two strands of DNA are held together by – Hydrogen bond.
58. Compound used for producing aritificial rain – Silver iodide.
59. Water Gas is a mixture of – Carbon monoxide & Hydrogen.
60. Cyanide process is used for the extraction of – Gold & Silver.
61. Froth and foams are examples of – Gas suspended in Liquid.
62. Element essential for the functioning of Thyroid gland – Iodine.
63. Highest Thermal Expansion at Room Temperature – Caesium.
64. The odor in onion and garlic is due to the presence of – Potassium.
65. Wood charcoal is used in the gas masks because – it absorbs gases.
66. The absorption of ink by blotting paper involves – Capillary action.
67. Heat produced on account of friction is transferred by – Conduction.
68. The glass used to make wind shields of motor vehicles – Safety glass.
69. The elements with the same number of neutrons are called – Isotones.
70. The compound used to regulate the setting time of cement – Gypsum.
71. The discomfort due to indigestion can be cured by taking – Baking Soda.
72. The non-metal which exists in liquid state at room temperature is – Bromine.
73. Teflon, the tough and fire resistant polymer, containing the halogen – Fluorine.
74. Cyanide poisoning causes death in seconds because – It causes cardiac arrest.
75. The Chemical that is used to treat cyanide poisoning – Sodium thiosulfate.
76. The catalyst used in the manufacture of Sulphuric Acid – Vanadium Pentoxide.
77. Heavy water of an atomic reactor is – an oxide of heavier isotope of Hydrogen.
78. The Green color seen in firework displays is due to the chloride salt of – Barium.
79. The main and most active ingredient of smelling salt is – Ammonium carbonate.
80. The Allotrope of carbon which is used as a moderator in nuclear reactors? Graphite.
81. The number of molecules contained in 1 mole of gases is called – Avogadro number.
82. Avogadro’s number is equal to – 6.02214076 × 10²³.
83. Total sum of the neutrons and protons in an atom – Mass number.
84. The compound used to protect wood furniture from termites – Zinc chloride.
85. Metal used for killing rats is – Zinc phosphide.
86. First Known Super Conductor – Mercury.
87. Metal abundant in Sea Water – Vanadium.
88. The Main Component of Endosulfan – Organo Chloride.
89. The chemical which is used in the voting ink – Silver nitrate.
90. The chemical compound for the dry cleaning of fabrics – Trichloroethylene.
91. The isotope of hydrogen that does not contain any neutrons in its nucleus is – Protium.
92. Muddy water is treated with alum in purification process, it is termed as – Coagulation.
93. The same group elements are characterized by – No of electrons in the outermost shell.
94. The type of battery which is used in the Mobile Phones – Lithium ion battery (3.6 volts).
95. The smell of the LPG gas is easily detectable due to the presence of – Ethanethiol (stench).
96. The Crimson red light produced while burning crackers is due to the presence of –  Strontium (Sr).
97. In an Electrochemical cell, the energy is converted from – Chemical energy into Electrical energy.
98. Breath analysers used by police to test drunken drivers works on the chemical basis of – Redox reactions.
99. Disease caused due to the presence of excess of copper in the human body – Wilson Disease (Genetic Disease).
100. The soft silvery metallic element which ionizes easily when heated or exposed to light and is present in atomic clocks is – Caesium.
101. The Bhopal gas tragedy of 1984 was due to the leakage of which gas – Methyl isocyanate (MIC).

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📝SideNotes:

• Lithium (density 0.53 gm/cc).
• Osmium (density (22.59 gm/cc).