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Sulphide ions react with `Na_2[Fe(NO)(CN)_5]` to form purple coloured compound `Na_4[Fe(CN)_5 (NOS)]` in the reaction, the oxidation state of iron changes from
A. `+2` to +3
B. `+3` to +2
C. `+2` to +4
D. does not change.

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by (94.5k points)
Correct Answer - No change

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