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Q.

Given the molecular formula of the hexacoordinated complexes (A) [CoCl3.6NH3] (B) [CoCl3.5NH3] (C) CoCl3.4NH3. If the number of coordinated 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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a

6, 5, 4

b

3, 2, 1

c

0, 1, 2

d

3, 3, 3

answer is B.

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Detailed Solution

The complexes can be written as followsCoNH36Cl3ACoNH35ClCl2BCoNH34ClCHence, number of primary valencies are 3, 2 and 1 respectively.
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