What happens when ozóne reacts with PbS?

Explanation

Siemen.s Ozoniser. This apparatus is made up of two co-axial tubes fused with each other at one end. The inside of the inner tube and the outside of the outer tube are covered with tin foils.
A current of dry and pure oxygen is passed through the space between the two tubes. After that it is subjected to silent electric discharge by connecting the tin foils to an induction coil. In this process, about 10% of oxygen is converted to ozone and the mixture coming out of the apparatus is ozonised oxygen.

(ii) Reaction of Ozone with Acidified `FeSO_4` Solution.
Reaction of acidified `FeSO_4` gives iron (III) sulphate and water as follows [i.e., `Fe^(2+)" oxidises to "Fe^(3+)`]
`6FeSO_4+3H_2SO_4+O_3rarr3Fe_2(SO_4)_3+3H_2O`