Which one of the following transition metal ions is diamagnetic?

{C O}^{2 +}

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{N i}^{2 +}

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{C u}^{2 +}

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{Z n}^{2 +}

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Solution

The correct option is C ${Z n}^{2 +}$
Electronic configuration of $C o^{+ 2}$ is $[A r] 4 s^{0} 3 d^{7}$
Unpaired electrons are present. paramagnetic

Electronic configuration of $N i^{+ 2}$ is $[A r] 4 s^{0} 3 d^{8}$
Unpaired electrons are present. paramagnetic

Electronic configuration of $C u^{+ 2}$ is $[A r] 4 s^{0} 3 d^{9}$
Unpaired electrons are present. paramagnetic

Electronic configuration of $Z n^{+ 2}$ is $[A r] 4 s^{0} 3 d^{10}$
No unpaired electrons are present. Diamagnetic.

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Similar questions

Z n^{2 +}, N i^{2 +}, C u^{2 +} and C r^{2 +}

M^{2 +}

Z n^{2 +} > S c^{2 +} = C u^{2 +} > T i^{2 +} = N i^{2 +} > V^{2 +} = C o^{2 +} > C r^{2 +} = F e^{2 +} > M n^{2 +}

C u^{2 +}, N i^{2 +}, C o^{2 +}, F e^{2 +}

M n^{2 +}

The incorrect statement(s) among the following is(are):

i) Primary valency of a transition metal ion in complex represent its oxidation number.

ii) $Z n^{2 +}$ is colourless.

iii) $M n C l_{2}$ exhibits green color in aqueous solution.

iv) $F e, C o, N i$ complexes are diamagnetic in nature.

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