Which of the following forms only $\mathrm{\pi }$ -bond using Molecular orbital theory:
 

How many nodal planes is/are present in ${\mathrm{\sigma }}_{1\mathrm{s}}$ bonding molecular orbital:  

The Bond order in $\mathrm{NO}$ is $2.5$ while that in $\mathrm{NO}+$ is $3$. Which of the following statéments is true for these two species:

Açcording to Molecular orbital theory which of the following statement about the, magnetic character 

and bönd order of ${\mathrm{O}}_2^{+}$ is correct.