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JEE Main levelOne or more correct optionsDifficulty 2 of 3cc060

Assume strong field CN- gives low spin and weak field H2O gives high spin. Select the diamagnetic species.

A $[Fe (H X_{2} O) X_{6}] X^{2 +}$
B $[Zn (NH X_{3}) X_{4}] X^{2 +}$
C $[Ni (CN) X_{4}] X^{2 -}$ (square planar)
D $[Fe (CN) X_{6}] X^{4 -}$

Answer: B, C, D

Zn X^{2 +}

is

d^{10}

, so diamagnetic. Fe(II) with CN- is

t_{2 g}^{6}

, diamagnetic. Ni(II)

d^{8}

in a square planar field has all electrons paired. High-spin Fe(II) in water has 4 unpaired electrons, so it is paramagnetic.

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