101 Chemistry General Questions For PSC

101 Chemistry General Questions

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.

    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).


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