p-Block elementsHard

Question

The reaction between ferric salt and aqueous sodium thiosulphate produces pink colour which soon diminishes. The pink colour is due to the formation of :

Options

A.[Fe(S2O3)3]4-
B.[Fe(S2O3)2]-
C.Fe2(S4O6)3
D.none of these

Solution

Fe3+ + 2S2O32-  →  [Fe(S2O3)2]- pink or violet complex.

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