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  1. Which one is the most reactive gaseous element?

  2. A.

     Chlorine

    B.

     Bromine

    C.

     Iodine

    D.

     Flourine

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  3. Which of the following metals occurs in free state ?

  4. A.

     Copper

    B.

     Iron

    C.

     Zinc

    D.

     Lead

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  5. The “King of Metals” is :

  6. A.

     Gold

    B.

     Silver

    C.

     Iron

    D.

     Aluminium

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  7. Which of the following metals is used in Space Crafts to withstand high temperatures ?

  8. A.

     Fe

    B.

     Ti

    C.

     Ni

    D.

     Pb

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  9. Phosphorus is kept in water because

  10. A.

     Its ignition temperature is very high

    B.

     Its ignition temperature is very low

    C.

     Its critical temperature is high

    D.

     Its critical temperature is low

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  11. The element which is used for vulcanizing rubber

  12. A.

     Sulphur

    B.

     Bromine

    C.

     Silicon

    D.

     Phosphorus

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  13. Chemically ‘Quick Silver' is known as

  14. A.

     Mercury

    B.

     Silver

    C.

     Aluminium

    D.

     Copper

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  15. The weight of 6.023 × 1023 atoms of carbon is

  16. A.

     12 gms

    B.

     120 gms

    C.

     1.2 gms

    D.

     0.12 gms

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  17. If there is one million Mg2+ ions in MgCl2, how many chloride ions are there?

  18. A.

     Two million

    B.

     One million

    C.

     Half a million

    D.

     Ten million

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  19. What is the mass percentage of carbon in carbon dioxide (CO2)?

  20. A.

     15.8 %

    B.

     20.1 %

    C.

     27.3 %

    D.

     32.3 %

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