Which of the following is the only exothermic oxide of chlorine?

Options

A. `CI_(2)O`
B. `CIO_(2)`
C. `Cl_(2)O_(6)`
D. `Cl_(2)O_(7)`

Answer

4

Explanation

Dicholrine heptoxide `(Cl_(2)O_(7))` is a colourless oily liqiud. It is moderately stable and is the only oxide of Cl which is produced in an exothermic reaction. It is shock sensitive.
It is made by carefully dehydrating perchloric acid with phosphorus pentoxide, or `H_(3)PO_(4)`
`2HCIO_(4)rarrH_(2)O+CI_(2)O_(7)`.
Its structure is

It is less reactive than the lower oxides, and does not igenite organic materials, It reacts with water, forming perchloric acid.
`Cl_(2)O_(7)+H_(2)Orarr2HCIO_(4)`