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Question
Which of the following salts reacts with HCl to precipitate sulphur?
Options
Na2SO3
NaHSO3
Na2S
Na2S2O3
MCQ
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Solution
Na2S2O3
Explanation:
Thiosulphates decompose with acids to liberate sulphur dioxide gas and deposit a yellow precipitate of elemental sulphur.
\[\ce{Na2S2O3 + 2HCl -> 2NaCl + H2O + SO2 ^ + S ↓}\]
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