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Question

A light bluish green crystalline compound responds to the following tests:
(i) Its aqueous solution gives a brown precipitate or colouration with alkaline K2[HgI4] solution.
(ii) Its aqueous solution gives a blue colour with K3[Fe(CN)6] solution.
(iii) Its solution in hydrochloric acid gives a white precipitate with BaCl2 solution. The molecular formula of the compound is FeSO4.(NH4)2SO4.6H2O (Mohr's salt)

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Solution

The light bluish green crystalline compound is FeSO4.(NH4)2SO4.6H2O (Mohr's salt).
(i) Its aqueous solution gives a brown precipitate or colouration with alkaline K2[HgI4] solution. This is due to presence of ammonium ions.
2K2HgI4+4KOH+NH4Hg2ONH2I+7KI+Cl+3H2O
iodideofmillonsbase,brownppt
(ii) Its aqueous solution gives a blue colour with K3[Fe(CN)6]
solution. This is due to presence of Fe(I) ions.
FeSO4(C)+K3[Fe(CN)6]KFeII[FeIII(CN)6](H),Turnbullsblue
(iii) Its solution in hydrochloric acid gives a white precipitate with BaCl2 solution.
This is due to presence of sulphate ions.
BaCl2+SO24BaSO4(white)+2Cl

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