1) Which one of the following statement is correct for $d^{4}$ ions [P= pairing energy] A) When $\triangle_{0} $>P, low-spin complex form B) When $\triangle _{0}$ <P, low-spin complex form C) When $\triangle _{0} $ >P, high -spin complex form D) When $\triangle _{0} $< P, both high -spin and low-spin complex form Answer: Option AExplanation:When value of $\triangle_{0}$ is greater than pairing energy , pairing of electron takes place hence low-spin complexes are formed
