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H(2)S gas is passed through an acidic so...

`H_(2)S` gas is passed through an acidic solution of `K_(2)Cr_(2)O_(7)` .The solution turns milky, why?

A

`CuS`

B

`PbS`

C

`ZnS`

D

`HgS`

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The correct Answer is:
3
ZnS is not obtained as `k_(sp)` of the zinc sulphide is very high. To precipitate `Zn^(2+)` high concentration of `S^(2-)` ions are required.
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