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A violet colour compound formed in detection of S in a compound is

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A violet colour compound formed in detection of S in a compound is
A. `Na_(4)[Fe(CN)_(5)NOS]`
B. `Na_(3)[Fe(CN)_(5)NOS]`
C. `Na_(2)[Fe(CN)_(5)NOS]`
D. `Na_(2)[Fe(CN)_(5)NO]`
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Correct Answer - A
`underset(" Sodium nitroprusside")(Na_(2)S+Na_(2)[Fe(CN)_(5)CO])rarrunderset(" Violet colour")(Na_(4)[Fe(CN)_(5)NOS])`
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