| (a) \([Cr(H_2O)_6]^{+3}\) | (i) \(t^2_{2g}eg^0\) |
| (b) \([Fe(H_2O)_6]^{+3}\) | (ii) \(t^3_{2g}eg^0\) |
| \((c) [Ni(H_2O)_6]^{+2}\) | (iii) \(t^3_{2g}eg^2\) |
| (d) \([V(H_2O)_6]^{+3}\) | (iv) \(t^6_{2g}eg^2\) |
Option (A) is correct: (a) corresponds to (ii), (b) to (iii), (c) to (iv), and (d) to (i).