Question

The reaction 2 Cu + O2 → 2 CuO has long been called an oxidation-reaction. Copper also reacts with chlorine:

Cu + Cl2 → CuCl2. In such a reaction:

a.Copper is also oxidized even though no oxygen is present.
b.Chlorine is oxidized.
c.Oxidation occurs, but reduction does not.
d.There is no change in oxidation numbers.

Answer 1

A. Copper is also oxidized even though no oxygen is present.

Answer 2

The reaction 2 Cu + O2 → 2 CuO has long been called an oxidation-reaction. Copper also reacts with chlorine:

Cu + Cl2 → CuCl2. In such a reaction:
A. Copper is also oxidized even though no oxygen is present.
This is because if it gains electrons, it is reduced - however, you can see that it lost an electron, while chlorine gained one, which means that this is oxidization.