What is the number of unpaired electrons in the $NO$ molecule?

Which of the following pairs of species are paramagnetic?

Which of the following species has the highest bond order?

Give the electron configuration,magnetic property,bond order,and energy diagram for the oxygen $(O_2)$ molecule.

The correct statement with regard to $H_{2}^{+}$ and $H_{2}^{-}$ is

Given below are two statements:
Statement $I$: $A$ hypothetical diatomic molecule with bond order zero is quite stable.
Statement $II$: As bond order increases,the bond length increases.
In the light of the above statements,choose the most appropriate answer from the options given below.