In complexes off wea field ligands, `Delta_(o) lt P` (pairing energy), the energy difference between `t_(2g) and e_(g)` sets is relatively less. Under the unfluence of strong field ligands, `Delta_(O) gt p` (Pairing energy), the energy difference between `t_(2g) and e_(g)` sets is relatively high.
Q. Which of the following is correct statement?

Options

A. Complex `[Co(H_(2)O)_(6)]^(2+)` is more stable than `[Co(H_(2)O)_(6)]^(3+)`
B. All compounds of `Ni(II)` are bound to be outer-d-orbital complexes
C. Stability constant for `[Ni(en)_(3)]^(2+)` is greater than stability constant for `[Ni(NH_(3))_(6)]^(2+)`
D. `Delta_(oct)` for `[Cr(H_(2)O)_(6)]^(3+)` is greater than `Delta_(oct)` for `[Cr(NH_(3))_(6)]^(3+)`

Answer

C