101 Chemistry General Questions For PSC

101 Chemistry General Questions

In this post, we are sharing a collection of 100 Chemistry General Knowledge questions and answers. Most of these one-liners are often asked in the SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC, IAS and Kerala PSC exams.


    100 Chemistry General Questions  & Answers

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

📝SideNotes:

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

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