Question

Which of the following pairs of complex ions has higher value of ${\Delta }_o$ and why?

$\left[Co\right(N{H}_3{)}_6{]}^{3+}and\left[Rh\right(N{H}_3{)}_6{]}^{3+}$

Answer 1

$△0=R{h}^{3+}>{CO}^{3+}$

Since down the group splitting increases due to increase in zeff down the group in d-block elements as aresults greater legand metal ouerlap takes place.