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

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

AIPMTAIPMT 1994

Solution:

When potassium iodide is reacted with CuS04, it gives iodine gas which is brown colour. This iodine react with sodium thiosulphate and form white precipitate of sodium tetrathionate.
$2CuSO_4 \, + \, 4 KI \, \longrightarrow \, K_2 SO_4 \, + \, I_2 \, + 2CuI$
$ 2Na_2S_2O_3 \, + \, I_2 \, \longrightarrow \, Na_2S_4O_6 \, + \, 2NaI $