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A certain compound (X) when treated with...

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

A

`K_2CO_3`

B

`KI`

C

`KBr`

D

`K_3PO_4`

Text Solution

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The correct Answer is:
B
When potassium iodide is reacted with `CuSO_4` it gives iodine gas which is brown colour. This iodine gas which is brown colour. This iodine reacted with sodium thiosulphate and form white precipitate of sodium tetrathionate.
`2CuSO_4 + 4KI to K_2SO_4 + I_2 uarr + 2CuI`
`2Na_2S_2O_3 + I_2 to Na_2S_4O_6 darr + 2NaI`
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