A solution containing an unknown anion is treated with dilute , evolving a gas that turns acidified paper green. Another portion of the exact same solution gives a deep violet coloration when treated

Question

A solution containing an unknown anion is treated with dilute $H_2SO_4$, evolving a gas that turns acidified $K_2Cr_2O_7$ paper green. Another portion of the exact same solution gives a deep violet coloration when treated with alkaline sodium nitroprusside. The anions sequentially identified are:

Prashant Kotian · Accepted Answer

Correct answer: B. The gas that turns dichromate green is , indicating a sulphite (). The deep violet complex formed with sodium nitroprusside () specifically confirms the presence of a sulphide ().

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