Question

All the following complexes show decrease in their weights when placed in a magnetic balance then the group of complexes having tetrahedral geometry is :
I $Ni(CO{)}_4$
II $K\left[Ag{F}_4\right]$
III $N{a}_2\left[Zn(CN{)}_4\right]$
IV $K_2\left[PtC{l}_4\right]$
V $\left[RhCl{\left(PP{h}_3\right)}_3\right]$

• A. II, III , V
• B. I, II, III
• C. I, III, IV
• D. none of these

Answer 1

Answer: (D)

(i) It is tetrahedral $\left(s{p}^3\right)$ because there is no $(n-1)d$ orbital vacant for $ds{p}^2$ hybridisation.
(ii) $Ag$ with $+3$ oxidation state and $4d^8$ configuration has square planar geometry.
(iii) It is tetrahedral $\left(s{p}^3\right)$ because there is no $(n-1)d$ orbital vacant for $ds{p}^2$ hybridisation.
(iv) Pt with $+2$ oxidation state and $5d^8$ configuration has square planar geometry.
(v) $Rh$ with $+1$ oxidation state and $4d^8$ configuration has square planar geometry.
When we place these complexes in a magnetic balance, then there is decrease in their weights. This indicates that the complexes are dimagnetic.