Which one of the following is diamagnetic ion?

Which one of the following is diamagnetic ion?
  1. $\mathrm{Co}^{2+}$
  2. $\mathrm{Cu}^{2+}$
  3. $\mathrm{Mn}^{2+}$
  4. $\mathrm{Sc}^{3+}$

Solution

(d) $\mathrm{Sc}^{3+}$ is diamagnetic as it does not contain any unpaired electron while others contain.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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