Philosopher's wool when heated with $BaO$ at $1100 \ ^oC$ gives the compound

Correct statements among $(i)$ to $(iv)$ regarding silicones are:
$(i)$ they are polymers with hydrophobic character
$(ii)$ they are biocompatible
$(iii)$ in general,they have high thermal stability and low dielectric strength
$(iv)$ usually they are resistant to oxidation and used as greases.

The oxidation state shown by silicon when it combines with strongly electropositive metals is

Which of the following is kept in water?

Glass reacts with $HF$ to produce

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{S}_8 + H_2O \longrightarrow$ No reaction