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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

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

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

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

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

  7. Which of the following is used in pencils?

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

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

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

  11. Chemical formula for water is

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

  13. The gas usually filled in the electric bulb is

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

  15. Washing soda is the common name for

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

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

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

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

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