$H_2S$ gas changes a filter paper dipped in lead acetate solution into

Give reasons for the following:
$(i)$ $CCl_4$ is immiscible in water,whereas $SiCl_4$ is easily hydrolyzed.
$(ii)$ Carbon has a strong tendency for catenation compared to silicon.

The structure of silicates in which three oxygen atoms of $[SiO_4]^{4-}$ are shared is known as:

$(BN)_n$ exists in

Which of the following statements are correct?
$1.$ Charcoal can be obtained by heating wood in the absence of air.
$2.$ Charcoal is an impure form of graphite.
$3.$ Diamond is thermodynamically the most stable allotrope of carbon.
$4.$ Coke is used as an oxidising agent during the extraction of iron from its ores.

Give the uses of silicones.