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Chemistry - section-17
Chemistry - section - 2
  1. Bleaching action of moist sulphur dioxide is because of its

    2. A.

     Basic property
    B.

     Acidic property
    C.

     Oxidising property
    D.

     Reducing property

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  2. Sulphur dioxide bleaches colouring matter by :

    3. A.

     Reduction
    B.

     Dehydration
    C.

     Decomposition
    D.

     Oxidation

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  3. Which one of the following is commonly used for pulp bleaching in the paper industry?

    4. A.

     Mild sulphuric acid
    B.

     Glucose isomerase
    C.

     Hydrogen peroxide
    D.

     Iodine and water

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  4. In upper layer of atmosphere ozone is formed by

    5. A.

     The action of ultraviolet rays on oxygen
    B.

     The combination of oxygen molecules
    C.

     Subjecting oxygen to high pressure
    D.

     The action of nitrogen on oxygen in atmosphere

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  5. Which one of the following is used to restore the colour of old oil paintings ?

    6. A.

     Ozone
    B.

     Hydrogen peroxide
    C.

     Barium peroxide
    D.

     Sodium peroxide

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  6. Ozone consists of

    7. A.

     Oxygen only
    B.

     Oxygen and Nitrogen
    C.

     Hydrogen and Carbon
    D.

     Oxygen and Carbon

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  7. Ozone layer is present in

    8. A.

     Troposphere
    B.

     Ionosphere
    C.

     Stratosphere
    D.

     Exosphere

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  8. The presence of ozone in the stratosphere is responsible for

    9. A.

     Increasing the average global temperature in recent years
    B.

     Higher rate of photosynthesis
    C.

     Checking the penetration of ultraviolet rays to the earth
    D.

     Supplying oxygen for people travelling in jets

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  9. The major use of sulphur is in the manufacture of

    10. A.

     H2SO4
    B.

     H2S
    C.

     SO2
    D.

     Fungicide

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  10. Percentage of lead in lead pencils is

    11. A.

     0
    B.

     31-66
    C.

     40
    D.

     80

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