Which of the following halides does not undergo hydrolysis?

The hybridisation of elements present in fullerene and graphite are respectively.

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:

Match the following:

List-$I$ (Compound)	List-$II$ (Use)
$A$. Kieselghur	$I$. Chromatographic material
$B$. Silica gel	$II$. Softening of hard water
$C$. $ZSM-5$	$III$. Filtration plants
$D$. Hydrated zeolites	$IV$. To convert alcohol directly into gasoline

Which one of the following is a good conductor of electricity?

Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that