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General Knowledge :: Chemistry

  1. Which one is the most reactive gaseous element?

  2. A.

     Chlorine

    B.

     Bromine

    C.

     Iodine

    D.

     Flourine


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

  4. A.

     Copper

    B.

     Iron

    C.

     Zinc

    D.

     Lead


  5. The “King of Metals” is :

  6. A.

     Gold

    B.

     Silver

    C.

     Iron

    D.

     Aluminium


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

  8. A.

     Fe

    B.

     Ti

    C.

     Ni

    D.

     Pb


  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


  11. The element which is used for vulcanizing rubber

  12. A.

     Sulphur

    B.

     Bromine

    C.

     Silicon

    D.

     Phosphorus


  13. Chemically ‘Quick Silver' is known as

  14. A.

     Mercury

    B.

     Silver

    C.

     Aluminium

    D.

     Copper


  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


  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


  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 %