Comment on the reactions of dihydrogen with (a) chlorine,(b) sodium and (c) copper (II) oxide.

Explanation

To address the question regarding the reactions of dihydrogen with chlorine, sodium, and copper(II) oxide, we will analyze each reaction step by step.

### Step 1: Reaction of Dihydrogen with Chlorine
1. **Write the Reaction**: When dihydrogen (H₂) reacts with chlorine (Cl₂), the reaction can be represented as:
\[ \text{H}_2 + \text{Cl}_2 \rightarrow 2 \text{HCl} \]
2. **Oxidation and Reduction**:
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