Question

A fire of lithium sodium and potassium can be extinguished by

Answer 1

Lithium, sodium and potassium are highly electropositive and highly reactive metals. When any of these come in contact with water, the reaction is so swift and intense that the hydrogen evolved catches fire instantaneously. The reaction thus is highly exothermic, therefore using water to quinch fires caused by these metals makes it explosively dangerous.Also with these metals CO2 and nitrogen too are reactive. Small fires can be quinched by asbestos blanket or by covering with dry sand, since these measures prevents contact with oxygen and water vapour and thus become effective.

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Answer 2

Carbon dioxide.

It does not help in burning, also it forms carbonate with alkali metals.

hope it helps..