The reaction of concentrated $HNO_3$ with iodine produces ....

Identify the correct decreasing order of boiling point for hydrides of halogens.

Which of the following interhalogen compounds is $NOT$ obtained by the action of fluorine with bromine? $(X=Br, X^{\prime}=F)$

Justify,by giving reactions,that among halogens,fluorine is the best oxidant and among hydrohalic compounds,hydroiodic acid is the best reductant.

With reference to aqua regia,choose the correct option$(s)$.
$(1)$ Reaction of gold with aqua regia produces $NO_2$ in the absence of air.
$(2)$ Aqua regia is prepared by mixing conc. $HCl$ and conc. $HNO_3$ in $3:1$ $(v/v)$ ratio.
$(3)$ Reaction of gold with aqua regia produces an anion having $Au$ in $+3$ oxidation state.
$(4)$ The yellow colour of aqua regia is due to the presence of $NOCl$ and $Cl_2$.

Which of the following is a correct covalent oxide of iodine?