1.

Which one of the following processes involve chemical reactions ?

Answer»

Storing of oxygen gas under pressure in a gas cylinder.
Liquefaction of air.
Keeping petrol in a chine dish in the open.
HEATING COPPER wire in presence of air at high temperature.

Solution :Copper wire on heating in presence of air at high temperature forms copper oxide, which is a CHEMICAL REACTION. Processes in (a), (b) and (c) do not INVOLVE any chemical change.


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