Why is ${\mathrm{CCl}}_4$ unaffected by water while ${\mathrm{SiCl}}_4$ is rapidly hydrolysed? Is ${\mathrm{CCl}}_4$ unreactive towards superheated steam?

Compare the shapes of the following pairs of molecules or ions and suggest reasons for the differences in each pair:

${\mathrm{CCl}}_4$ and ${\mathrm{TeCl}}_4$

Compare the shapes of the following pairs of molecules or ions, and suggest reasons for the differences in each pair:

${\mathrm{CO}}_2$ and ${\mathrm{NO}}_2$

Compare the shapes of the following pairs of molecules or ions, and suggest reasons for the differences in each pair

${\mathrm{SiF}}_4$ and ${\mathrm{ICl}}_4^{-}$