Given the molecular formula of the hexacoordinated complexes (A) `[CoCl_(3).6NH_3]` (B) `[CoCl_(3).5NH_3]` (C) `CoCl_(3).4NH_3`. If the number of coordinated `NH_3` molecules in A, B and C respectively are 6, 5 and 4, the primary valency in (A), (B) and (C) are:A. (a) 6, 5, 4B. (b) 3, 2, 1C. (c) 0, 1, 2D. (d) 3, 3, 3

Given the molecular formula of the hexacoordinated complexes (A) `[CoC

1.	Given the molecular formula of the hexacoordinated complexes (A) `[CoCl_(3).6NH_3]` (B) `[CoCl_(3).5NH_3]` (C) `CoCl_(3).4NH_3`. If the number of coordinated `NH_3` molecules in A, B and C respectively are 6, 5 and 4, the primary valency in (A), (B) and (C) are:A. (a) 6, 5, 4B. (b) 3, 2, 1C. (c) 0, 1, 2D. (d) 3, 3, 3
Answer» Correct Answer - B The complexes can be written as follows `underset((A))[Co(NH_3)_6]Cl_3underset((B))[Co(NH_3)_5Cl]Cl_2underset((C))[Co(NH_3)_4Cl_4]Cl` Hence, number of primary valencies are 3, 2 and 1 respectively.

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