In $HCHO$,the carbon atom has which hybridization?

If the dipole moment of an $MX_3$ molecule is zero,then the orbitals used by $M$ $(atomic\ number < 21)$ in sigma bonding are ....

What is the correct order of carbon-carbon bond length in the following molecules?

In which of the following pairs do both the species have $sp^{3}$ hybridization?

The hybridisations of $N$,$C$ and $O$ shown in the following compound are:

The correct order of increasing $s$-character (in percentage) in the hybrid orbitals of the following molecules/ions is: $(I) \, CO_3^{2-}$,$(II) \, XeF_4$,$(III) \, I_3^-$,$(IV) \, NCl_3$,$(V) \, BeCl_2$.