Sulphide ions react with Na2Fe(NO)(CN)5 to form a purple coloured compound Na4[Fe(CN)5(NOS)]. In the reaction, the oxidation state of iron;

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Changes from + 2 to +3

Changes from +3 to +2

Changes from +2 to +4

Does not change

answer is D.

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Detailed Solution

No change in oxidation number of Fe.

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