### Coordination Compounds Question 1

#### Question 1 - 24 January - Shift 1

The primary and secondary valencies of cobalt

respectively in $[Co(NH_3)_5 Cl] Cl_2$ are :

(1) 3 and 5

(2) 2 and 6

(3) 2 and 8

(4) 3 and 6

## Show Answer

#### Answer: (4)

#### Solution:

#### Formula: Primary and secondary valency

$[Co(NH_3)_5 Cl] Cl_2$

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.