underset((X))("Salt of iron") overset(Na_(2)S_(2)O_(3))rarr Violet complex overset("On standing")rarr underset((Z))("Green solution") Wite oxidation number of Fe in (Z).

underset((X))("Salt of iron") overset(Na_(2)S_(2)O_(3))rarr Violet com

1.	underset((X))("Salt of iron") overset(Na_(2)S_(2)O_(3))rarr Violet complex overset("On standing")rarr underset((Z))("Green solution") Wite oxidation number of Fe in (Z).
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