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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3as220

Which of the following ground-state ions are paramagnetic?

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

Answer: B, C

Cu X^{+}

is

3 d^{10}

(no unpaired electrons).

Cr X^{3 +}

is

3 d^{3}

(3 unpaired) and

Fe X^{3 +}

is

3 d^{5}

(5 unpaired), so both are paramagnetic.

Sc X^{3 +}

is

[Ar]

with no unpaired electrons.

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