A d-block element forms octahedral complex but its spin magnetic moment remains same either in strong field or in weak field ligand. Which of the following is/are correct ?

Options

A. d-block element always forms colourless compound
B. Number of electrons in `t_(2g)` orbitals are higher than in `e_(g)` orbitals
C. It can have either `d^(3)`or `d^(8)` configuration
D. It can have either `d^(7)` or `d^(8)` configuration

Answer

b,c

Explanation

`Ni^(2+)(d^(8))" or "Cr^(3+)(d^(3))` form octahedral complexes whether the ligand is strong or weak field ligand, they have same magnetic moment. They are all colored.