1.

Role of nitre in the manufacture of gun powder is ______ .

Answer»

to supply OXYGEN
to supply nitrogen
to decrease the RATE of combustion
to absorb TEMPERATURE produced by combustion

Solution :Nitre is `KNO_(3)`, which on heating gives `KNO_(2) "and" O_(2)`. The LIBERATED oxygen is the SOURCE for the combustion of carbon and sulphur.


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