Lead is present in maximum quantity in which of the following types of glass?

Name the kind of silicate formed when two silicate units $(SiO_4)^{4-}$ share one oxygen atom.

Discuss the reactivity of group $14$ elements towards water and halogens.

Assertion : $PbI_4$ is a stable compound.
Reason : Iodide stabilizes higher 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 are respectively:

Non-oxide ceramics can be