In which of the following pairs do the molecules have a bond order of $3$ and are isoelectronic?

Among the following,the species having the smallest bond length is:

The molecular orbital configuration of a diatomic molecule is
$\sigma 1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2 \sigma 2p_x^2 \pi 2p_y^2 \pi 2p_z^2$
Its bond order is

The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals:
$A$. have the same energy
$B$. have the minimum overlap
$C$. have same symmetry about the molecular axis
$D$. have different symmetry about the molecular axis
Choose the most appropriate from the options given below:

Which of the following is incorrect regarding the conversion of $N_2$ and $O_2$ into their respective monocations $N_2^+$ and $O_2^+$?

In the molecular orbital diagram for the molecular ion,$N_2^+$,the number of electrons in the $\sigma_{2p_z}$ molecular orbital is