Which one is the anhydride of ${\mathrm{HClO}}_{\mathrm{4}}$?

Among the following, the CORRECT order of acidity is ______.

Which of the following element does NOT form diatomic molecule?

Electron configuration of only one $\mathrm{p}-$block element is exceptional. One molecule of that element consists of how many atoms of it?

The formation of ${{\text{O}}_{\text{2}}}^{\text{+}}{\text{[PtF}}_{\text{6}}{\text{]}}^{\text{-}}$ is the basis for the formation of xenon fluorides. This is because ______.

The noble gas which forms the maximum number of compounds is ______.

The CORRECT geometry and hybridization for ${\text{XeF}}_{\text{4}}$ are ______ respectively.

Identify a metalloid from the following list of elements:

What is the most abundant element on earth?