How is ozone prepared from oxygen? Explain how does it reacts with the following
a) Pbs b) KI c) Hg d) Ag e) C₂H₄ f) C₂H₂

Preparation:
1) Pure, cold and dry O₂ is subjected to silent electric discharge, then ozone is formed
2) This process is carried out in an apparatus called ozonizer
$3{\mathrm{O}}_2\underset{\mathrm{discharge}}{\overset{\mathrm{silent} \mathrm{electric}}{\rightleftharpoons }}2{\mathrm{O}}_3,\mathrm{\Delta H}=284.5\mathrm{kJ}/\text{ mole }$

Reactions:
a) Ozone oxidizes black Pbs to white PbSo₄
$\mathrm{PbS}+4{\mathrm{O}}_3\to {\mathrm{PbSO}}_4+4{\mathrm{O}}_2$
b) Ozone oxidizes moist KI to I₂
$2\mathrm{KI}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_3\to 2\mathrm{KOH}+{\mathrm{I}}_2+{\mathrm{O}}_2\uparrow$
c) When ozone is passed through liquid mercury then mercury loses its meniscus and stick to the walls of container. This is called tailing of mercury
$2\mathrm{Hg}+{\mathrm{O}}_3\to {\mathrm{Hg}}_2\mathrm{O}+{\mathrm{O}}_2\uparrow$
d) Ozone oxidizes Ag to Ag₂O
$2\mathrm{Ag}+{\mathrm{O}}_3\to {\mathrm{Ag}}_2\mathrm{O}+{\mathrm{O}}_2$
e) Ethylene oxidizes ozone to ethylene ozonide which on hydrolysis in the presence of Zn dust gives formaldehyde

f) C₂H₂: Acetylene oxidizes ozone to acetylene ozonide which on hydrolysis in the presence of Zn dust gives glyoxal.