1.

Formation of purple colour on the addition of sodium nitroprusside to sodium carbonate extract indicates the presence of

Answer»

`PO_(4)^(3-)`
`SO_(3)^(2-)`
`S^(2-)`
`S_(2)O_(3)^(2-)`

Solution :`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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