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What do you observe when : Black lead su...

What do you observe when : Black lead sulphide is heated.

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### Step-by-Step Solution: 1. **Identify the Substance**: The substance in question is black lead sulfide, which is chemically represented as PbS. 2. **Heating the Substance**: When black lead sulfide (PbS) is heated, it undergoes a chemical reaction. 3. **Presence of Oxygen**: The reaction typically occurs in the presence of oxygen. This is important as it facilitates the conversion of PbS to another compound. ...
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