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  4. Cl2O7 is the anhydride of

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Q. $Cl_2O_7 $ is the anhydride of

WBJEEWBJEE 2018The p-Block Elements - Part2

Solution:

$Cl_2O_7$ is the anhydride of $HClO_4$. It reacts with water slowly to give perchloric acid
$Cl_2O_7 + H_2 O \to \underset{\text{Perchlororic acid}}{2HClO_4}$
Its structure is as follows
image
It is less reactive than other oxides of chlorine and does not react with $P, S$, coal or paper at room temperature.