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Given the molecular formula of the hexa coordinated complexes
$(A) {CoCl}_{3} \cdot 6 {NH}_{3}$ $(B) {CoCl}_{3} .5 {NH}_{3}$ $(c) {CoCl}_{3} .4 {NH}_{3}$
If the number of co-ordinated NH3 molecules in A, B and C respectively
are 6, 5 and 4, the primary valency in (A), (B) and (C) are

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6, 5, 4

3, 2, 1

0, 1, 2

3, 3, 3

answer is B.

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Detailed Solution

The complexes can be written as follows

$\underset{(A)}{[Co {[{NH}_{3})}_{6}]} {Cl}_{3}; \underset{(B)}{[Co {({NH}_{3})}_{5} Cl] {Cl}_{2}}; \underset{(C)}{[Co {({NH}_{3})}_{4} {Cl}_{2}] Cl} .$

The no. of Chloride ions present out side the sphere = Primary valence.

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