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  1. Which of the following chemicals is used in foam fire extinguishers?
    1. Aluminium sulphate
    2. Copper sulphate
    3. Cobalt sulphate
    4. Nickel sulphate
Correct Option: A

Aluminium sulphate is used in 'foam' fire extinguishers, which contains radium bicarbonate and aluminium sulphate in separate receptacles on being mixed they form the foam of bubbles of CO2.


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