The number and type of bonds in $C_2^{2 - }$ ion in $CaC_2$ are
One $\sigma $ bond and one $\pi - $ bond
One $\sigma $ bond and two $\pi - $ bond
Two $\sigma $ bond and two $\pi - $ bond
Two $\sigma $ bond and one $\pi - $ bond
Use molecular orbital theory to explain why the $Be_{2}$ molecule does not exist.
Explain energy level diagram for molecular orbital form by $1\mathrm{s}$ orbitals.
Which of the configuration is correct :-
Compare the relative stability of the following species and indicate their magnetic properties;
$O _{2}, O _{2}^{+}, O _{2}^{-}$ (superoxide), $O _{2}^{2-}$ (peroxide)
Which one of the following oxides is expected exhibit paramagnetic behaviour