The formula of the following silicate anion structure is,where $\cdot = Si$ atom,$o = O$ atom.

The element that shows greater ability to form $p\pi - p\pi$ multiple bonds is

Manmade silicate is $........$
$........$ is used to convert alcohols directly into gasoline. Give the use of hydrated zeolites.

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:

$A$ black sulphide precipitate when treated with ozone becomes white. The white compound is:

The gas produced by the passage of air over hot coke is