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Formation of purple colour on the addition of sodium nitroprusside to sodium carbonate extract indicates the presence of
A. `PO_(4)^(3-)`
B. `SO_(3)^(2-)`
C. `S^(2-)`
D. `S_(2)O_(3)^(2-)`

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`underset("nitroprusside")underset("Sodium")(Na_(2))[(CN)_(5)NO]+Na_(2)S overset(Delta)to underset("(Violet purple)")underset("Sodium thionitroprusside")(Na_(4)[(CN)_(5)NOS])`

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