Statement-1 : Hund’s rule violates in $[C o {(C N)}_{6}]^{3 -}$ complex ion
Statement-2 : Degeneracy of d orbitals is lost under any field ligand.

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Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.

Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.

Statement-1 is true, statement-2 is false.

Statement-1 is false, statement-2 is true.

answer is D.

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Detailed Solution

Hund's rule is never violated while filling of electrons into splitted $' d'$ orbitals, But while pairing of electrons into lower energy level, consideration of $C F S E$ value is carried out.
If $C F S E > P :$ Electrons will first pair in upto lower energy level and then they start filling into higher energy level.
If $C F S E < P :$ Electrons will go into higher energy level without pairing in lower energy level.]