Which of the following elements exhibit metallic nature among $C$,$Si$,$Ge$,$Sn$,and $Pb$?

The correct statements with respect to halides of group $14$ elements are:
$I$. Both $CCl_4$ and $SiCl_4$ undergo hydrolysis
$II$. $GeX_4$ is more stable than $GeX_2$
$III$. $PbX_4$ is less stable than $PbX_2$
$IV$. Stability of dihalides decreases down the group.

Which of the following statements is correct for the compounds $HF, HBr, H_2Se, H_2Te, H_3P$?

The neutral oxide among the following is

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

Which of the following statements is correct with respect to the properties of elements in the carbon family as the atomic number increases?