Question
Match column A and column B and choose the right code :
| Column A | Column B |
| 1. Removal of electron from any substance | (a) Reduction |
| 2. $\begin{array}{l}2 Na ( s )+ H _2(g) \longrightarrow 2 NaH ( s )\end{array}$ | (b) Both oxidant and reductant |
| 3. Conversion of mercuric chloride to mercurous chloride. | (c) Reduction of $H _2$ |
| 4. $H _2 O _2$ | (d) Oxidation |
