The acidic solution of a salt produces blue color with $K I$ starch solution. The salt may be :

sulphite

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bromide

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nitrite

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chloride

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Solution

The correct option is D nitrite
Nitrites react with potassium iodide in the presence of dilute sulphuric acid to liberate iodine. Iodine forms a blue-black complex with starch.

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K I

H_{2} S O_{4}

H_{2} S O_{4}

(A) + d i l . H_{2} {S O}_{4} + K I ⟶

A

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