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Which one among the following pairs of i...

Which one among the following pairs of ions cannot be separated by `H_(2)S` in dilute hydrochloric acid ?

A

`Bi^3+`  `Sn^2+`

B

` AI^(3+) Hg^(2+)`

C

`Zn^(2+)Cu^(2+)`

D

`Ni^(2+),Cu^(2+)`

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The correct Answer is:
A
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