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Q.

The primary and secondary valencies of cobalt respectively in [Co(NH3)5Cl]Cl2 are:

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a

3 and 5

b

3 and 6

c

2 and 6

d

2 and 8

answer is D.

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Detailed Solution

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 [Co(NH3)5Cl]Cl2
Oxidation number of Co  is +3.
So primary valency is 3.
It is an octahedral complex so secondary valency 6
Or Co-ordination number 6.

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