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General Knowledge :: Chemistry

  1. Which of the following is not a method of preparing oxygen?

  2. A.

     Electrolysis of water

    B.

     Fractional distillation of liquid air

    C.

     Decomposition of potassium permanganate

    D.

     Decomposition of manganese dioxide


  3. Which one of the following statements is not correct? Vulcanisation of rubber makes it

  4. A.

     Soft and flexible

    B.

     Strong and hard

    C.

     Chemical resistant

    D.

     Withstand higher temperatures


  5. The compounds formed when hydrogen combines with p-block elements are called

  6. A.

     Ionic hydrides

    B.

     Molecular hydrides

    C.

     Metallic hydrides

    D.

     Polynuclear hydrides


  7. In vulcanisation process, rubber can be hardened by adding

  8. A.

     Nitrogen

    B.

     Silicon

    C.

     Sulphur

    D.

     Alcohol


  9. The substance that is added to make natural rubber strong and more bouncy is

  10. A.

     Polythene

    B.

     Sponge

    C.

     Sulphur

    D.

     Chlorine


  11. In arc welding, Argon is used because of its

  12. A.

     Low reactivity with metal

    B.

     Ability to lower the melting point of the metal

    C.

     High flammability

    D.

     High calorific value


  13. An inert gas mixed with oxygen given to patients suffering from restricted breathing is

  14. A.

     Helium

    B.

     Krypton

    C.

     Radon

    D.

     Argon


  15. Which of the following elements is obtained from seaweeds ?

  16. A.

     Iodine

    B.

     Vanadium

    C.

     Argon

    D.

     Sulphur


  17. Silica gel is a

  18. A.

     Moisturizer

    B.

     Flavouring agent

    C.

     Drying agent

    D.

     Delicious food


  19. Silicon is a

  20. A.

     Semiconductor

    B.

     Insulator

    C.

     Non-conductor

    D.

     Conductor