1.

A complex compound of Co^(3+) with molecular formula CoCl_(x).yNH_(3) gives a total of 3 ions on dissovling it in water.To satisfy both primary and secondary valencies in this complex, the number of Cl^(-) ions required is

Answer»

one
four
three
zero

Solution :As cobalt is PRESENT as `Co^(3+)` as coordination NUMBER of cobalt is 6, the molecular formula of compound should be `CoCl_(3). yNH_(3)`. Now, as it gives a total of three ion when dissoolved in water, its structural formula must be `[CoCl(NH_(3))_(5)]Cl_(2)`.
`[CoCl(NH_(3))_(5)]Cl_(2)hArr[CoCl(NH_(3))_(5)]^(2+)+2Cl^(-)`
THUS only one `Cl^(-)` ion is satisfying both primary and secondary VALENCY of `Co^(3+)` in this compound.


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