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CFCs are used as refrigerants and in fir...

CFCs are used as refrigerants and in fire extinguishers.

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Ozone (O_3 ) is a molecule formed by three atoms of oxygen. While O_2 , which we normally refer to as oxygen, is essential for all aerobic forms of life. Ozone, is a deadly poison. The amount of ozone in the atmosphere began to drop sharply in the 1980s. This decrease has been linked to synthetic chemicals like chlorofluorocarbons (CFCs) which are used as refrigerants and in fire extinguishers. In 1987, the United Nations Environment Programme (UNEP) succeeded in forging an agreement to freeze CFC production at 1986 levels. Why is UV radiation harmful ?

Ozone (O_3 ) is a molecule formed by three atoms of oxygen. While O_2 , which we normally refer to as oxygen, is essential for all aerobic forms of life. Ozone, is a deadly poison. The amount of ozone in the atmosphere began to drop sharply in the 1980s. This decrease has been linked to synthetic chemicals like chlorofluorocarbons (CFCs) which are used as refrigerants and in fire extinguishers. In 1987, the United Nations Environment Programme (UNEP) succeeded in forging an agreement to freeze CFC production at 1986 levels. Where is O_3 present ?

Knowledge Check

  • Fire extinguisher is:

    A
    `CO_(2)`
    B
    `CCl_(4)`
    C
    `CHCl_(3)`
    D
    `H_(2)CO_(3)`

  • Pyrene(a fire extinguisher) is:

    A
    `C Cl_(4)`
    B
    `SiCl_(4)`
    C
    `GeCl_(4)`
    D
    `SbCl_(5)`

  • Fire is extinguished by

    A
    removing all combustible substances
    B
    cutting off supply of air
    C
    cooling the burning substances
    D
    all of these

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    Pyene (a fire extinguisher) is

    Chlorofluorocarbons (CFCs) are widely used as refrigerants. Then why it is suggested to reduce its emission as far as possible ? Explain

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