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An oxide of chlorine with water gives the strongest acid. The ratio of chlorine and oxygen in its formula is
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$2: 7$
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 $2: 7$.
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