Which of the following hybridisation has maximum $s-$character?

Which of the following contains an $sp^2$ hybridized carbon?

If a molecule $MX_3$ has zero dipole moment,the sigma bonding orbitals used by $M$ are

What is $sp^{3}$ hybridization? Give its characteristics.

Among $SO_2, NF_3, NH_3, XeF_2, ClF_3$ and $SF_4$,the hybridization of the molecule with non$-zero$ dipole moment and highest number of lone$-pairs$ of electrons on the central atom is

The hybridizations of atomic orbitals of nitrogen in $NO_2^+$,$NO_3^-$ and $NH_4^+$ respectively are