If Hund rule violates

CHEMISTRY · Subjective · CBSE · Chemistry · Chemical Bonding and Molecular Structure · Chemical Bonding and Molecular Structure

Problem

If Hund rule violates, then find the total number of species among following which will be diamagnetic :

\text{B}_2

\text{O}_2

\text{N}_2^-

\text{C}_2

\text{NO}

\text{OF}

\text{N}_2^{2-}

\text{BN}