Calculate the n-factor of reactants in the given chemical changes?
(b) `I^(-)rarrI_(2)`

Explanation

To calculate the n-factor of the reactant in the given chemical change \( I^- \rightarrow I_2 \), we need to follow these steps:

### Step 1: Identify the change in oxidation state
In the reaction, iodide ion \( I^- \) is being converted to molecular iodine \( I_2 \). The oxidation state of iodine in \( I^- \) is -1, and in \( I_2 \), the oxidation state is 0.

### Step 2: Determine the number of electrons transferred
For each iodide ion \( I^- \) that is oxidized to \( I_2 \), the change in oxidation state is:
- From -1 to 0, which is an increase of 1.
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