The hybridization of the central atom will change when

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

The ammonium ion $(NH_4^+)$ is:

Hybridisation states of $C$ in $CH_3^+$ and $CH_4$ are

Give an example and explain the meaning of hybridization.

Consider the following reactions:
$(i)$ $PCl_3 + 3H_2O \to H_3PO_3 + 3HCl$
$(ii)$ $SF_4 + 3H_2O \to H_2SO_3 + 4HF$
$(iii)$ $BCl_3 + 3H_2O \to H_3BO_3 + 3HCl$
$(iv)$ $XeF_6 + 3H_2O \to XeO_3 + 6HF$
Then according to given information the incorrect statement is