How is ozone prepared ? How does it react with the following ?
PbS

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) to 2O_(3), DeltaH^(@)(298K)=142 K//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.
Properties,
PbS is oxidised to `PbSO_(4)`
`PbS(s)+4O_(3)(g) to 2 KOH (aq)+I_(2)(s)+O_(2)(g) 2KOH (aq)+I_(2)(s)+O_(2)(g)`.