MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp -Block Elements (group 15-18)Chemical Properties of Group 16 Elements

Ozone is prepared by the action of silent electric discharge upon oxygen in an apparatus called ozonizer. The reaction

A.is exothermic

B.is endothermic✓ Correct

C.leads to the dissociation of the O₂ molecule

D.leads to the formation of

Explanation

The reaction taking place for the formation of 3 O in the ozonizer is given below: Electric Discharge 2 3 3O 2O → The enthalpy of this reaction is H 248.5 Since the value of H is +Ve. So the reaction absorbs energy i.e. the reaction is endothermic. Hence, option (b) is the correct answer.

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