Q. Which of the following primary and secondary valencies are not correctly marked against the compound?
[ $\text{p}$ = Primary valency; $\text{s}$ = Secondary valency]

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A

$\left[\right.Cr\left(\right.NH_{3}\left(\left.\right)_{6}\left]\right.Cl_{3},p=3,s=6$

B

$K_{2}\left[\right.PtCl_{4}\left]\right.,p=2,s=4$

C

$\left[\right.Pt\left(\right.NH_{3}\left(\left.\right)_{2}Cl_{2}\left]\right.,p=2,s=4$

D

$\left[\right.Cu\left(\right.NH_{3}\left(\left.\right)_{4}\left]\right.SO_{4},p=4,s=4$

Solution:

In $\left[\right.Cu\left(\right.NH_{3}\left(\left.\right)_{4}\left]\right.SO_{4}$ primary valency is 2 and secondary valency is 4. In rest other complexes the values of primary and secondary valencies are correctly given.

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