Why can SiCl4 hydrolyse but CCl4 can't not hydrolyse?

Answer 1

Two ways of looking at this: There are d-orbitals in the valence shell of silicon, which can be occupied in the reactive intermediate that occurs between reactant and hydrolysis product. To make sense of that, it is necessary to look at the mechanism in detail.
The simpler way of looking at it is that silicon is not carbon- it occurs further down the group and thus has more metallic character- ie, its Si-C bonds are more polarised and thus more prone to reaction.

Answer 2

no need

Answer 3

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