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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 (R) with H2S in an ammoniacal medium. The precipitate R gave a coloured solution (S) when treated with H2O2 in an aqueous NaOH medium.
The coloured solution S contains



Your Answer
A

FE2(SO4)3
 

Your Answer
B

CuSO4
 

Your Answer
C

ZnSO4
 

Correct Answer
D

Na2CrO4


Solution

The correct option is C

Na2CrO4


The following reactions are happening in these experiments:



From these equations, it can be seen that the solution S should contain Cr3+ ion. Hence, option D is correct.

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