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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

Verified by Experts

The correct Answer is:
B
`4KI+2CuSO_4tounderset("White ppt.")(2K_2SO_4)+Cu_2I_2+underset("Brown colour in solution")(I_2)`
`I_2+underset("Hypo")(2Na_2S_2O_3)tounderset(ubrace("Sod. tetrathioate")_("Colourless"))(Na_2S_4O_6+2NaI)`
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