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Question

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 H2S in a dilute mineral acid medium. However, it gave a precipitate with H2S in an ammonical medium. The precipitate R gave a coloured solution (S), when treated with H2O2 in an aqueous NaOH medium.

The coloured solution S contains:


A
Fe2(SO4)3
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B
CuSO4
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C
ZnSO4
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D
Na2CrO4
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Solution

The correct option is D Na2CrO4
Cr3+H2S−−−−−−ammonicalCr(OH)3NaOH−−−H2O2Na2CrO4

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