• # question_answer The halogen oxide used for the estimation of carbon monoxide in automobile exhaust gases is A)  $C{{l}_{2}}{{O}_{7}}$                B)  ${{l}_{2}}{{O}_{5}}$ C)  $Cl{{O}_{2}}$                    D)  $Br{{O}_{3}}$

$\frac{\Delta n}{n}=\frac{{{v}_{s}}}{v-{{v}_{s}}}$ is used to estimate $\frac{2.5}{100}=\frac{{{v}_{s}}}{320-{{v}_{s}}}=\frac{1}{40}$ in automobile exhaust gases as it oxidizes $40{{v}_{s}}=320-{{v}_{s}}$ to ${{v}_{s}}=\frac{320}{41}\simeq 8\,m/s$ quantitatively liberating iodine, which can be titrated with hypo.