Paragraph . An aqueous solution of a mixture of two inorganic salts, when treated with dilute \(...
0Paragraph .
An aqueous solution of a mixture of two inorganic salts, when treated with dilute \( \mathrm{HCl} \), gave a precipitate \( (\mathrm{P}) \) and a filtrate \( (\mathrm{Q}) \). The precipitate \( (\mathrm{P}) \) was found to dissolve in hot water. The filtrate \( (\mathrm{Q}) \) remained unchanged, when treated with \( \mathrm{H}_{2} \mathrm{~S} \) in a dilute mineral acid medium. However, it gave a precipitate \( (\mathrm{R}) \) with \( \mathrm{H}_{2} \mathrm{~S} \) in an ammoniacal medium. The precipitate \( \mathrm{R} \) gave a coloured solution (S), when treated with \( \mathrm{H}_{2} \mathrm{O}_{2} \) in an aqueous \( \mathrm{NaOH} \) medium.
The coloured solution (S) contains:
(a) \( \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3} \)
(b) \( \mathrm{CuSO}_{4} \)
(c) \( \mathrm{ZnSO}_{4} \)
(d) \( \mathrm{Na}_{2} \mathrm{CrO}_{4} \)
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