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Question
Identify the gas evolved and give the chemical test in the following case:
Dilute hydrochloric acid reacts with iron (II) sulphide.
Solution
Gas Evolved:
When dilute hydrochloric acid reacts with iron (II) sulphide, the gas evolved is hydrogen sulphide.
Reaction:
\[\ce{FeS + 2HCl -> FeCl2 + H2S ^}\]
Chemical Test for Hydrogen Sulphide: To test for \[\ce{H2S}\] gas, you can use lead acetate paper:
- Moisten a strip of lead acetate paper.
- Expose it to the gas evolved.
Observation: If \[\ce{H2S}\] is present, the lead acetate paper will turn black due to the formation of lead sulphide \[\ce{(PbS)}\].
\[\ce{Pb(C2H3O2)2 + H2S -> PbS + 2CH3COOH}\]
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