Hydrogen sulphide turns lead acetate paper ______[blue/black]

Explanation

To answer the question "Hydrogen sulphide turns lead acetate paper ______[blue/black]," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reactants**:
- Hydrogen sulphide (H₂S) is a colorless gas that can be detected using lead acetate paper.

2. **Reaction with Lead Acetate**:
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