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Which of the following aqueous high-spin ions are paramagnetic?

A $Ti X^{3 +}$
B $Sc X^{3 +}$
C $Zn X^{2 +}$
D $Cu X^{2 +}$

Answer: A, D

Ti X^{3 +}

(

3 d^{1}

) and

Cu X^{2 +}

(

3 d^{9}

) each have one unpaired electron.

Zn X^{2 +}

(

3 d^{10}

) and

Sc X^{3 +}

(

3 d^{0}

) have none, so they are diamagnetic.

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