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The primary and secondary valencies of the central metal ion in the complex $[Co {({NH}_{3})}_{6}] {Cl}_{3}$ respectively are

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a

6 and 3

b

6 and 6

c

3 and 3

d

3 and 6

answer is D.

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Detailed Solution

Cobalt ion has a primary and secondary valency of 3 and 6, respectively.
The charge on cobalt ion is +3, which balances the charges on carbonate and chloride ions. As a result, cobalt ion has a primary valency of 3.
In the coordination sphere, cobalt ion is surrounded by four mono dentate and one bidentate ligand (4 ammonia and one carbonate). As a result, the coordination number (secondary valency) is 6.

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