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A complex compound of Co^(3+) with molec...

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

A

one

B

four

C

three

D

zero

Text Solution

Verified by Experts

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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