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Question

A certain inorganic compound (A) on heating loses water of crystallisation. On further heating a blackish brown powder (B) and two oxides of sulphur (C&D) are obtained. The powder (B) on boiling with HCl gives a yellow solution (E). When H2S is passed in (E) a white turbidity (F) and an apple green solution (G) is obtained. The solution (E) on treatment with thiocyanate ion gives blood red compound (H). Identify G and H :

A
(G)FeCl2(H)Fe(CNS)3
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B
(G)FeCl3(H)Fe(CNS)2
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C
(G)FeCl2(H)Fe(CNS)2
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D
(G)FeCl3(H)Fe(CNS)3
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Solution

The correct option is A (G)FeCl2(H)Fe(CNS)3
Option (A) is correct
FeSO4.7H2O(A)FeSO4+7H2O
FeSO4Fe2O3(B)+SO2(C)+SO3(D)
Fe2O3HClFeCl3(E)+H2O
FeCl3+H2SS(F)+FeCl2(G)+HCl
FeCl3+(CNS)2Fe(CNS)3(H)

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