How is ozone prepared from oxygen ? Explain its reaction with
Hg

Explanation

Preparation of Ozone : When a slow dry stream of oxygen is passed through a silent electrical discharge, oxygen is converted to ozone. This product is called ozonised oxygen.
`3O_(2) rightarrow 2O_(3), triangle H^(@) (298K) = + 142 kj "/" mol`
If high concentration of ozone `(gt 10%)` is required, a battery of ozonisers can be used. Pure ozone can be condensed in a vessel surrounded by liquid oxygen.
Mercury is oxidised to `Hg_(2)O` by ozone. As `Hg_(2)O` dissolves in Hg, Hg loses its meniscus and sticks to glass surface. It is called .tailing of mercury..
`2Hg + O_(3) rightarrow Hg_(2)O + O_(2)`