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An aqueous solution of a mixture of two ...

An aqueous solution of a mixture of two inorganic salts when treated with dilute HCl, gave a precipitate (P) and a filtrate (Q). The precipitate (P) was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with `H_(2)S` in a dilute mineral acid medium. However, it gave a green precipitate (R) in with `H_(2)S` in ammoniacal medium. The precipitate (R) gave a coloured solution (S), when treated with `H_(2)O_(2)` in an aqueous NaOH medium.
The coloured solution (S) contains

A

`Fe_(2)(SO_(4))_(3)`

B

`CuSO_(4)`

C

`ZnSO_(4)`

D

`Na_(2)CrO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
d
The precipitate `(P)` contains `Pb^(2+)`
`Pb^(2+) + 2HCI rarr PbCI^(2+) overset(Hot) underset(water)(to) Solution`
The filtrate `(Q)` contains `Cr^(+3)`, since it does give any precipitate with `H_(2)S` in acide medium .But gives precipitate`(R )` with `H_(2)S` in alkline medium So, `R` is `Cr(OH)_(3)` and S is `Na_(2)CrO`
`Cr^(+3) overset(Ammonical) underset(H_(2)S)to Cr(OH)_(3) overset(H_(2)O_(3))underset(NaOH)to underset(yellow soln)(Na_(2)CrO_(4))`
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