Question

Primary and secondary valency of $Ptin\left[Pt{\left(en\right)}_2{Cl}_2\right]{Cl}_2$ are:

• A. 4, 4
• B. 4, 6
• C. 6, 6
• D. 4, 2

Answer 1

Answer: (B)

4, 6

Primary valency is the number of ions required to satisfy the charge on the metal ion.

Secondary valency is the number of ions of molecules that are coordinated to the metal ion.

So, in $\left[Pt\right(en{)}_{2}C{l}_2]C{l}_2$

Charge on $Pt\Rightarrow x+2\left(0\right)+2(-1)=+2\Rightarrow x=+4$

So, Primary valency is $4$

Secondary valency is $2\left(2\right)+2=6$

$\therefore$ Answer is option B.