Question

A Xenon compound $\text{'}\mathrm{A}\text{'}$ upon partial hydrolysis gives ${\mathrm{XeO}}_2{\mathrm{F}}_2.$ The number of lone pairs of electrons presents in compound $\mathrm{A}$ is _______. (Round off to the nearest integer)

Answer 1

Answer: 19

Partial hydrolysis

$$\begin{gathered} {\mathrm{XeF}}_6\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{XeOF}}_4\left(\mathrm{g}\right)+2\mathrm{HF}\left(\mathrm{l}\right) \\ {\mathrm{XeF}}_6\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{XeO}}_2{\mathrm{F}}_2\left(\mathrm{g}\right)+4\mathrm{HF}\left(\mathrm{l}\right) \end{gathered}$$

Complete hydrolysis

${\mathrm{XeF}}_6\left(\mathrm{g}\right)+3{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{XeO}}_3\left(\mathrm{g}\right)+6\mathrm{HF}\left(\mathrm{l}\right)$

Each $\mathrm{F}$ has $3$ lone pair of electrons. So six $\mathrm{F}$atom give $18$ lone pair of electrons. It can be clear from the below structure:

The central $\mathrm{Xe}$ atom has one lone pair of electron. So the total number of lone pairs of electrons in compound $\left(\mathrm{A}\right)$ is $19.$