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Test for Ammonia

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Question

What are the changes that take place in lead nitrate solution by passing impure hydrogen through it ?

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Solution

The impurities present in hydrogen gas is sulphide and the hydrogen sulphide reacts with lead nitrate solution forming black colour precipitate of lead sulphide.
Pb(NO₃)₂ + H₂S --------> PbS + 2 HNO₃

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