1.

KCN is highly poisonous while K_(4)[Fe(CN)_(6)] is not. Why ?

Answer»

Solution :KCN ionizes to give `CN^(-)` ions which combine with the protein (cytochrome 'c') present in the BLOOD and thereby block the oxygen binding site of the ENZYME resulting into DEATH
`KCNrarrK^(+)+CN^(-)`
`K_(4)[Fe(CN)_(6)]` ionizes as
`K_(4)[Fe(CN)_(6)]rarr4 K^(+)+[Fe(CN)_(6)]^(4-)`
The complex ion `[Fe(CN)_(6)]^(4-)` does not ionize to give `CN^(-)`ions. Hence, it is not toxic.


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