Violet coloured complex obtained in the detection of Sulphur is

Violet coloured complex obtained in the detection of Sulphur is

(a) Na₂[Fe(NO)(CN)₅]
(b) Na₃[Fe(ONSNa)(CN)₅]
(c) Na₄[Fe(CN)₅NOS]
(d) both (Na₃[Fe(ONSNa)(CN)₅)] and (Na₄[Fe(CN)₅NOS])

both (Na₃[Fe(ONSNa)(CN)₅]) and (Na₄[Fe(CN)₅NOS])

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