A sparkless current is passed through oxygen to prepare ozone. Why?

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Solution

For the production of pure ozone from dioxygen, it is necessary to have pure dioxygen molecule with an ideal low temperature of $273 K$ , which is not possible to have in presence of any molecular activator and even if spark in discharge tube, because the continuous spark too, may increase the temperature level.
Hence, the production of ozone is done in a sparkless electric current, which only provides a medium of ionization and not interferes in any other surrounding parameters.

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