Chemistry - Coordination Chemistry Question with Solution | TestHub

In which of the following reaction spin only magnetic moment and crystal field splitting pattern both are change.

(P) ${\mathrm{Ni}}_{(\text{aq. })}^{+2}\underset{{\mathrm{Hdmg}}^{-}}{\overset{{\mathrm{NH}}_4\mathrm{OH}+{\mathrm{NH}}_4\mathrm{Cl}}{\to }}$

(Q) ${\mathrm{Fe}}_{(\text{aq. })}^{+2}\underset{\text{ Excess }}{\overset{\mathrm{KCN}}{\to }}$

(R) ${\mathrm{Co}}_{\text{(aq.) }}^{2+}\underset{\mathrm{HCl}}{\overset{\text{ Concentrated }}{\to }}$

(S) ${\mathrm{Co}}_{\text{(aq.) }}^{2+}\stackrel{{\mathrm{NH}}_4\mathrm{Cl}+{\mathrm{NH}}_4\mathrm{OH}+\text{ air }}{\to }$