A certain hypohalite on treating with hot and conc. $\mathrm{NaOH}$ forms anions $\mathrm{P}$ and $\mathrm{Q}$. More stable anion among $\mathrm{P}$ and $\mathrm{Q}$ can be obtained by neutralizing its conjugate acid $\mathrm{X}$. Upon heating $\mathrm{X}$ to very high temperature, a compound $\mathrm{Y}$ is formed, which is used in estimation of a toxic gas which have $300$ times stronger affinity for haemoglobin than dioxygen. Then which of the following statements are true.

Consider the following properties of noble gases.
$\mathrm{I}:$ They readily form compounds which are colourless.
$\mathrm{II}:$ They generally do not form ionic compounds.
$\mathrm{III}:$ Xenon has variable oxidation states in its compounds.

$\mathrm{IV}:$ The smaller $\mathrm{He}$ and $\mathrm{Ne}$ do not form clathrate compounds.
Select the correct properties.

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 ______.

${\mathrm{Br}}_2+{\mathrm{F}}_2\left(\mathrm{excess}\right)\to \mathrm{A}\stackrel{\mathrm{Hydrolysts}}{\to }\mathrm{B}+\mathrm{C}$

The summation of atomicities of compound $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ is: