A certain compound (X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is

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(b) KI. The compound KI reacts with copper sulfate to form cuprous iodide (CuI), which is brown. On adding hypo (sodium thiosulfate), the brown CuI is reduced to white CuI₂, confirming the reaction.

A certain compound (X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is

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