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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df165

Which of the following complex ions have exactly two unpaired electrons?

A $[V (H X_{2} O) X_{6}] X^{3 +}$
B $[Ni (CN) X_{4}] X^{2 -}$
C $[Mn (CN) X_{6}] X^{3 -}$ (low spin)
D $[NiCl X_{4}] X^{2 -}$ (tetrahedral)

Answer: A, C, D

Ni(II)

d^{8}

tetrahedral has 2 unpaired electrons, low-spin Mn(III)

d^{4}

is

t_{2 g}^{4}

with 2, and V(III)

d^{2}

has 2.

[Ni (CN) X_{4}] X^{2 -}

is square-planar and diamagnetic.

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