Name the substance oxidised and substance reduced in the following reactions :
`PbS+4H_(2)O_(2)toPbSO_(4)+4H_(2)O`

Explanation

To determine the substances oxidized and reduced in the reaction \( \text{PbS} + 4 \text{H}_2\text{O}_2 \rightarrow \text{PbSO}_4 + 4 \text{H}_2\text{O} \), we can follow these steps:

### Step 1: Identify the oxidation states of the elements in the reactants and products.

- In \( \text{PbS} \):
- Lead (Pb) has an oxidation state of +2.
- Sulfur (S) has an oxidation state of -2.

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