What is produced by the hydrolysis of $(Me)_2SiCl_2$?

Which of the following is the most stable?

Identify $X, Y$ and $Z$ in the following reaction: $2 CH_3Cl + X \xrightarrow[570 \ K]{Y} Z$

How is dry ice produced? Mention its uses.

Which of the following elements shows a stable $+2$ oxidation state?

The catenation tendency of $C$,$Si$ and $Ge$ is in the order $Ge < Si < C$. The bond energies (in $kJ \ mol^{-1}$) of $C-C$,$Si-Si$ and $Ge-Ge$ bonds,respectively,are: