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NEET levelSingle correct optionDifficulty 1 of 3ss011

Which of the following ions is diamagnetic?

A $Cr X^{3 +}$
B $Zn X^{2 +}$
C $Cu X^{2 +}$
D $Fe X^{3 +}$

Answer: B

Zn X^{2 +}

is

3 d^{10}

with all electrons paired.

Cu X^{2 +}

(

d^{9}

),

Fe X^{3 +}

(

d^{5}

) and

Cr X^{3 +}

(

d^{3}

) have unpaired electrons.

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