First slide

Werner's theory

Question

Given the molecular formula of the hexacoordinated complexes (A) [CoCl₃.6NH₃] (B) [CoCl₃.5NH₃] (C) CoCl₃.4NH₃. If the number of coordinated NH₃molecules in A, B and C respectively are 6, 5 and 4, the primary valency in (A), (B) and (C) are:

Moderate

A

6, 5, 4
B

3, 2, 1
C

0, 1, 2
D

3, 3, 3

Solution

The complexes can be written as follows
$\underset{(A)}{[Co {({NH}_{3})}_{6}] {Cl}_{3}} \underset{(B)}{[Co {({NH}_{3})}_{5} Cl] {Cl}_{2}} \underset{(C)}{[Co {({NH}_{3})}_{4}] Cl}$
Hence, number of primary valencies are 3, 2 and 1 respectively.

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