Which of the following compounds of lead is used in the match industry?

$SiF_4$ gets hydrolysed giving .......

Consider the following statements:
$I$. In diamond,each carbon atom is $sp^3$-hybridised.
$II$. Graphite has planar hexagonal layers of carbon atoms.
$III$. Silicones being surrounded by non-polar alkyl groups are water repelling in nature.
$IV$. The order of catenation in group $14$ elements is $Si > C > Sn > Ge > Pb$.
The correct statements are:

If in a mineral $1000$ tetrahedral basic unit of silicates are arranged in a chain,then what will be the formula of the anion of that mineral?

Which of the following halides does not undergo hydrolysis?

Which among the following oxides is amphoteric in nature?