Ozone is obtained from oxygen

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(C) Ozone $(O_3)$ is prepared from oxygen $(O_2)$ by passing silent electric discharge through pure, dry oxygen. This process is endothermic and requi

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by silent electric discharge

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(C) Ozone $(O_3)$ is prepared from oxygen $(O_2)$ by passing silent electric discharge through pure, dry oxygen. This process is endothermic and requires energy to break the strong $O=O$ bond in the oxygen molecule. The reaction is as follows:$3O_2 \xrightarrow{	ext{Silent electric discharge}} 2O_3$ $(\Delta H = +142 \ kJ/mol)$Since the reaction is endothermic, a silent electric discharge is used to prevent the decomposition of ozone back into oxygen due to excessive heat. Thus, option $(c)$ is correct.

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