Write the balanced chemical equations for developing a black and white photographic film Also, give the reason as to why the solution of sodium thiosulphate on acidification turns milky white and give the balanced chemical equation of this reaction .

Explanation

### Step-by-Step Solution

**Step 1: Write the balanced chemical equation for developing a black and white photographic film.**

In black and white photography, silver bromide (AgBr) is the light-sensitive compound used. The developer commonly used is hydroquinone. The reaction that occurs during the development process can be represented as follows:

1. **Reactants:** Silver bromide (AgBr) and hydroquinone (C6H6O2).
2. **Products:** Silver (Ag), hydrogen bromide (HBr), and quinone (C6H4O2).
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