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NEET levelSingle correct optionDifficulty 1 of 3df006

Which of the following ions is diamagnetic?

A $Ni X^{2 +}$
B $Mn X^{2 +}$
C $Zn X^{2 +}$
D $Cu X^{2 +}$

Answer: C

Zn X^{2 +}

is

3 d^{10}

with all electrons paired.

Cu X^{2 +}

(

d^{9}

),

Ni X^{2 +}

(

d^{8}

) and

Mn X^{2 +}

(

d^{5}

) have 1, 2 and 5 unpaired electrons, so they are paramagnetic.

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