Academic Experts Solutions for Chapter: p-Block Elements (Halogens & Noble Gases), Exercise 2: KVPY PROBLEMS (PREVIOUS YEARS)

Chlorine gas is produced from $\mathrm{HCl}$ by the addition of-

The gas produced on heating ${\mathrm{MnO}}_2$ with concentrated $\mathrm{HCl}$ is

${\mathrm{XeF}}_6$ hydrolyses to give an oxide. The structure of ${\mathrm{XeF}}_6$ and the oxide, respectively are

Doping silicon with boron produces a:

The numbers of lone pair(s) on $\mathrm{Xe}$ in ${\mathrm{XeF}}_2$ and ${\mathrm{XeF}}_4$ are, respectively:

${\mathrm{MnO}}_2$ when fused with $\mathrm{KOH}$ and oxidised in air gives a dark green compound $\mathrm{X}.$ In acidic solution, $\mathrm{X}$ undergoes disproportion to give an intense purple compound $\mathrm{Y}$ and ${\mathrm{MnO}}_2.$ The compounds $\mathrm{X}$ and $\mathrm{Y},$ respectively, are:

When treated with conc. $\mathrm{HCl},$ ${\mathrm{MnO}}_2$ yields a gas $\left(\mathrm{X}\right)$ which further reacts with $\mathrm{Ca}(\mathrm{OH}{)}_2$ to generate a white solid $\left(\mathrm{Y}\right).$ The solid $\mathrm{Y}$ reacts with dil. $\mathrm{HCl}$ to produce the same gas $\mathrm{X}.$ The solid $\mathrm{Y}$ is:

The tendency of $\mathrm{X}$ in ${\mathrm{BX}}_3(\mathrm{X}=\mathrm{F}, \mathrm{Cl}, \mathrm{OMe}, \mathrm{N}{\left(\mathrm{Me}\right)}_2)$ to form a $\mathrm{\pi }$ bond with boron follows the order