Which of the following mixtures would gi...

Which of the following mixtures would give a black precipitate on passing `H_2S` through its acidified aqueous solution ?

A

`Cu^(2+)` and `Pb^(2+)`

B

`Zn^(2+)` and `Mg^(2+)`

C

`Mg^(2+)` and `Fe^(2+)`

D

`Mg^(2+)` and `Ni^(2+)`

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The correct Answer is:

A

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