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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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Knowledge Check

  • A complex compound of Co^(3+) with molecular formula CoCl_(x.y)NH_3 gives a total of 3 ions on dissolving 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

  • A complex compound of Cu^(3+) with molecular formula CoCl_(x).yH_(2)O gives a total of 3 ions on dissolving in water. To satisy both the primary and secondary valencies in the complex , the number of Cl^(-) ions required is :

    A
    one
    B
    four
    C
    three
    D
    zero

  • The complex CoCl_(3).4NH_(3) ionizes to give

    A
    one `Cl^(-)` ion
    B
    two `Cl^(-)` ions
    C
    three `Cl^(-)` ions
    D
    no `Cl^(-)` ion.

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