How is ozone prepared from oxygen ? Explain its reaction with PbS.

1.	How is ozone prepared from oxygen ? Explain its reaction with PbS.
Answer» Preparation of Ozone : A slow dry stream of oxygen under silent electric discharge to form ozone (about `10%`) The product obtained is known as ozonised oxygen. `3O_(2)to2O_(3) DeltaH^(@)=142"kJ"//"mole"` `to` The formation of ozone is an endothermic reaction. `to` It is necessary to use silent electric discharge in the preparation of `O_(3)` to prevent its de composition Reaction with PbS : Black lead sulphide oxidised to white lead sulphate in presence of ozone. `PbS+4O_(3)toPbSO_(4)+4O_(2)`.

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How is ozone prepared from oxygen ? Explain its reaction with PbS.

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