The carbon atoms in an acetylene molecule are in which state of hybridisation?

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

What is the shape of the $SF_3Cl_3$ molecule?

$sp^3$ hybridized nitrogen is present in

The hybridisations of the atomic orbitals of nitrogen in $NO_{2}^{-}$,$NO_{2}^{+}$ and $NH_{4}^{+}$ respectively are.

Sulphur reacts with chlorine in $1:2$ ratio and forms $X$. Hydrolysis of $X$ gives a sulphur compound $Y$. What is the structure and hybridisation of the anion of $Y$?