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(D) \( \frac{\mathrm{BaCl}_{2} \text { in }}{\text { presence of } \mathrm{HCl}} \)
(A) \( \underset{\text { with } \mathrm{K}_{2} \mathrm{HgI}_{4}}{\stackrel{\text { aq.solution }}{\longrightarrow}} \)
(B)
white ppt.
(Light green)
Brownppt.
crystalline compound
Aqueous solution with \( \downarrow \)
(C) Blue
Find out \( (A) \) :
(a) \( \mathrm{FeSO}_{4} \)
(b) \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \)
(c) \( \mathrm{FeSO}_{4}\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O} \)
(d) None of these
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