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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_(2)CrO_(3)`

B

`KI`

C

`KBr`

D

`K_(3)PO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`CuSO_(4)+2KI rarr CuI_(2)+K_(2)SO_(4)`
`2CuI_(2)rarr underset("White ppt")Cu_(2)I_(2)darr+underset("Brown")I_(2)uarr`
`I_(2)+2Na_(2)S_(2)O_(3)rarr Na_(2)S_(4)O_(6)+underset("Colourless")2NaI`
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