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.

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:

Which of the following statements are correct.

(a) Anhydrous hydrogen fluoride is a liquid at ordinary temperature while other halogen acid are gases.

(b) Lead acetate does not form any precipitate with $\mathrm{HF}$ acid but other halogen acid from precipitates.

(c) $\mathrm{HF}$ is heated with a mixture of ${\mathrm{MnO}}_2$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$, no gas is evolved but in case of $\mathrm{HCl}, \mathrm{HBr}$ and $\mathrm{Hl}$ acids gases are evolved.

(d) $\mathrm{HF}$ is not oxidised by strong oxidising agent, but other halogen acid are oxidised.