A colorless solid salt (A) reacts with dilute to produce a colorless gas (B). Gas (B) reduces acidified solution to a green solution. Furthermore, when gas (B) is passed through an aqueous solution of

Question

A colorless solid salt (A) reacts with dilute $H_2SO_4$ to produce a colorless gas (B). Gas (B) reduces acidified $K_2Cr_2O_7$ solution to a green solution. Furthermore, when gas (B) is passed through an aqueous solution of $H_2S$, a milky white turbidity is observed. Identify gas (B).

Prashant Kotian · Accepted Answer

Correct answer: B. The salt contains a sulphite () ion. Upon reaction with dilute acid, it releases gas. acts as a reducing agent, turning orange acidified into green ions. Additionally, reacts with (where acts as an oxidizing agent) to precipitate elemental sulphur, causing the milky white turbidity: .

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