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Assertion :When H(2)S is passed through...

Assertion :When `H_(2)S` is passed through a solution of `CuSO_(4)` no precipitate of `CuS` is abtain until the solution is acidified with `HCI`
Reasion: The solution products constant of `CuS` is not so high as to require a high concen tration of `S^(2-)` for the precipitate of `CuS`

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The correct Answer is:
d
It is true that precipitate of `CuS` does not requir a high concentration of `S^(2-)` ions But this does not mean that `CuS` will not precipitate with a higher concentration of `S^(2-)` In fact ,the precipitate will be faciliated by a high concentration of `S^(2-)` ,i.e. when the solution is not acidified so , (A) is false ,but (R ) is true
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