Which of the following salt will evolve sulphur dioxide gas along with formation of yellowish turbidity when treated with dilute $H_{2} S O_{4}$ ?

Sodium sulphide

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Sodium sulphite

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Sodium thiosulphate

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Sodium sulphate

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Solution

The correct option is B Sodium thiosulphate
Option (C) is correct.
Sodium thiosulphate will evolve sulphur dioxide gas along with formation of yellowish turbidity when treated with dilute $H_{2} S O_{4}$ .
Adding dilute sulphuric acid to a solution with thiosulphate ions yields a solution with precipitate, elemental sulfur, and release a burnt rubber smell (gaseous sulphur dioxide)
$2 H^{+} + S_{2} O_{3}^{2 +} ⟶ S + S O_{2} + H_{2} O$

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