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Question
Which of the following gas is liberated when hydrochloric acid is added to iron(II) sulphide?
Options
Hydrogen
Chlorine
Carbon dioxide
Hydrogen sulphide
MCQ
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Solution
Hydrogen sulphide
Explanation:
Dilute acid decomposes metal sulphides to release hydrogen sulphide gas (H2S), which smells like rotten eggs.
\[\ce{FeS + 2HCl -> FeCl2 + H2S ^}\]
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Chapter 8: Study of Compounds: Hydrogen Chloride - Intext Question [Page 170]
