Question

which one of the following processes involve chemical reaction a.storing of oxygen gas under pressure in a gas cylinder​

Answer 1

Answer:

D.Heating copper wire in presence of air at high temperature

Explanation:

Answer 2

Answer:

Complete answer:

In this situation, the highly heated copper (Cu) reacts with oxygen (O2) of the air, copper undergoes an oxidation reaction to give out a new product, that is a thin layer of copper oxide (CuO) on the surface of metallic copper.