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Chemistry

Give a chemical test to distinguish between the following gases:

Hydrogen chloride and hydrogen sulphide

Practical Chemistry

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Answer

Hydrogen chloride — Forms a curdy white precipitate on passage through AgNO3 solution.

AgNO3 [aq.] + HCl ⟶ AgCl ↓ [curdy white ppt.] + HNO3

Hydrogen sulphide — Turns moist lead acetate paper silvery black.

Pb(CH3COO)2 [colourless] + H2S ⟶ PbS ↓ [black] + 2CH3COOH

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