1.

Which of the following pairs of cations can be separated by passing H_(2)S through the mixture in the presence of 0.2 M HCl?

Answer»

`Pb^(2+), CU^(2+)`
`Ag^(+), Cu^(2+)`
`CD^(2+), Bi^(3+)`
`Cu^(2+), Zn^(2+)`

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