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Name the gas that turns colourless PbNO3...

Name the gas that turns colourless `PbNO_3` solution into black.

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**Step-by-Step Solution:** 1. **Identify the Colorless Solution**: The question refers to a colorless solution of lead(II) nitrate, which is represented as Pb(NO3)2. 2. **Determine the Gas**: The gas that can react with lead(II) nitrate to produce a black precipitate is hydrogen sulfide (H2S). 3. **Chemical Reaction**: When hydrogen sulfide gas is bubbled through the lead(II) nitrate solution, a chemical reaction occurs. The lead(II) ions (Pb²⁺) from the lead(II) nitrate react with sulfide ions (S²⁻) from hydrogen sulfide to form lead(II) sulfide (PbS), which is a black precipitate. ...
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