Which one of the following species is diamagnetic in nature?

Which one of the following species is diamagnetic in nature?
  1. $\mathrm{He}_2^{+}$
  2. $\mathrm{H}_2$
  3. $\mathrm{H}_2^{+}$
  4. $\mathrm{H}_2^{-}$

Solution

$\mathrm{H}_2 \sigma 1 \mathrm{~s}^2 \sigma^* 1 \mathrm{~s}^0$, no unpaired so diamagnetic

Asked in: JEE Main 2005

Practice more Chemical Bonding and Molecular Structure questions on Aicharya