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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

Liquefaction of air

C

Keeping petrol in a China dish in the open

D

Heating copper wire in the presence of air at high temperature

Text Solution

Verified by Experts

The correct Answer is:
D
A chemical reaction is a change in which one or more substance (s) or reactant(s) react to form new substance (s) with entirely different properties.
`underset("wire")underset("Copper")(2Cu)+O_(2)tounderset("oxide")underset("Copper")(2CuO)`
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