Mention the uses of pure forms of germanium and silicon.

Identify the incorrect statement about $SiO_2$ (silica) from the following.

In the laboratory,silicon can be prepared by the reaction:

Which of the following substances is acidic?

The last element of group-$14$ is found to be

The order of catenation property for $C, Si,$ and $Ge$ is $Ge < Si < C$. What will be the bond dissociation energy (in $kJ \ mol^{-1}$) for $C-C, Si-Si,$ and $Ge-Ge$ bonds respectively?