Calculate the n-factor of reactants in the given chemical changes
(b) `CuSrarrCu^(2+)+SO_(2)`

Explanation

To calculate the n-factor of the reactant in the given chemical change \( \text{CuS} \rightarrow \text{Cu}^{2+} + \text{SO}_2 \), we will follow these steps:

### Step 1: Identify the oxidation states
- In the reactant \( \text{CuS} \), the oxidation state of copper (Cu) is +1 and the oxidation state of sulfur (S) is -2.
- In the products, \( \text{Cu}^{2+} \) has an oxidation state of +2, and in \( \text{SO}_2 \), the oxidation state of sulfur (S) is +4.

### Step 2: Determine the change in oxidation states
- For copper (Cu):
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