Which of the following is a constituent of foam type fire extinguisher?

Dilute sulphuric acid

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Sodium carbonate

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Dilute hydrochloric acid

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All of above

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Solution

The correct option is A Dilute sulphuric acid
The foam type of fire extinguisher is also called as soda acid fire extinguisher. It consists of dilute sulphuric acid and sodium bicarbonate (soda). When it is released under high pressure in the form of foam, it covers the surface of fire and controls it by cutting off oxygen.

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