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  1. Brass gets discoloured in air because of the presence of which of the following gases in air?

    2. A.
    Oxygen
    B.
    Hydrogen sulphide
    C.
    Carbon dioxide
    D.
    Nitrogen

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  2. Which of the following is a non metal that remains liquid at room temperature?

    3. A.
    Phosphorous
    B.
    Bromine
    C.
    Chlorine
    D.
    Helium

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  3. Chlorophyll is a naturally occurring chelate compound in which central metal is

    4. A.
    copper
    B.
    magnesium
    C.
    iron
    D.
    calcium

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  4. Which of the following is used in pencils?

    5. A.
    Graphite
    B.
    Silicon
    C.
    Charcoal
    D.
    Phosphorous

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  5. Which of the following metals forms an amalgam with other metals?

    6. A.
    Tin
    B.
    Mercury
    C.
    Lead
    D.
    Zinc

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  6. Chemical formula for water is

    7. A.
    NaAlO2
    B.
    H2O
    C.
    Al2O3
    D.
    CaSiO3

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  7. The gas usually filled in the electric bulb is

    8. A.
    nitrogen
    B.
    hydrogen
    C.
    carbon dioxide
    D.
    oxygen

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  8. Washing soda is the common name for

    9. A.
    Sodium carbonate
    B.
    Calcium bicarbonate
    C.
    Sodium bicarbonate
    D.
    Calcium carbonate

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  9. Quartz crystals normally used in quartz clocks etc. is chemically

    10. A.
    silicon dioxide
    B.
    germanium oxide
    C.
    a mixture of germanium oxide and silicon dioxide
    D.
    sodium silicate

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  10. Which of the gas is not known as green house gas?

    11. A.
    Methane
    B.
    Nitrous oxide
    C.
    Carbon dioxide
    D.
    Hydrogen

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