Q1 / 155 · WBJEE 2018 · Chemistry

$\mathrm{Cl}_{2} \mathrm{O}_{7}$ is the anhydride of

  • A
    $\mathrm{HOCl}$
  • B
    $\mathrm{HClO}_{2}$
  • C
    $\mathrm{HClO}_{3}$
  • Correct answer
    D
    $\mathrm{HClO}_{4}$

Solution

$\mathrm{Cl}_{2} \mathrm{O}_{7}$ is the anhydride of $\mathrm{HClO}_{4}$. It reacts with water slowly to give perchloric acid. $\mathrm{Cl}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \underset{\text { Perchloric acid }}{2 \mathrm{HClO}_{4}}$ Its structure is as follows: Figure It is less reactive than other oxides of chlorine and does not react with $P, S,$ coal or paper at room temperature.

Hence, the correct answer is option: 'D'.

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