The $\Delta_{0}$ value of $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ is $8500 \mathrm{cm}^{-1}$. The $\Delta_{0}$ values for $\left[\mathrm{NiCl}_{6}\right]^{4-}$ and $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}$ compared to $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ are
(a)higher and lower, respectively
(b)lower and higher, respectively
(c)higher in both complex ions
(d)lower in both complex ions.
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.