If the boiling point of ${\mathrm{H}}_2\mathrm{O}$ is $373 \mathrm{K}$, and  the boiling point of ${\mathrm{H}}_2\mathrm{S}$ will be :

The compound/s which will show significant intermolecular $\mathrm{H}$-bonding is/are :

The number of species having non-pyramidal shape among the following is:

$\left(\mathrm{A}\right) {\mathrm{SO}}_3$ 

$\left(\mathrm{B}\right) {\mathrm{NO}}_3^{-}$

$\left(\mathrm{C}\right) {\mathrm{PCl}}_3$

$\left(\mathrm{D}\right) {\mathrm{CO}}_3^{2-}$