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Which one of the following processes inv...

Which one of the following processes involve chemical reactions?

A

Storing of oxygen gas under pressure in a gas cylinder

B

Liquification of air

C

Keeping petrol in a china dish in the open

D

Heating copper wire in presence of air at high temperature

Text Solution

Verified by Experts

The correct Answer is:
D
Chemical changes involve formation of new compounds from one or more substances. On heating copper wire in presence of air at high temperature copper (II) oxide is formed.
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