An oxide of chlorine with water gives the strongest acid. The ratio of chlorine and oxygen in its formula is
An oxide of chlorine with water gives the strongest acid. The ratio of chlorine and oxygen in its formula is
2:1
$1: 2$
$2: 7$
$1: 3$
Solution
Chlorine heptoxide $\mathrm{Cl}_2 \mathrm{O}_7$ reacts with water to give perchloric acid $\mathrm{HClO}_4$ which is the strongest acid. Thus, the ratio of $\mathrm{Cl}$ to $\mathrm{O}$ is $2: 7$.