Classify the reaction
`(i) 2NO_(2) + 2OH^(-) to NO_(2)^(-)+H_(2)O`
(ii) `2Pb(NO_(3))_(2) to 2PbO+ 2NO_(2) + (1)/(2) O_(2)`

Explanation

To classify the given reactions, we will analyze each one step by step, checking the oxidation states of the elements involved.

### Reaction (i):
**Reaction:**
\[ 2 \text{NO}_2 + 2 \text{OH}^- \rightarrow \text{NO}_2^- + \text{H}_2\text{O} \]

1. **Identify the oxidation states of nitrogen in the reactants and products:**
- In \( \text{NO}_2 \):
...