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Ozone is formed by ______ dissociation of molecular oxygen into individual oxygen atoms.

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Ozone is formed by ______ dissociation of molecular oxygen into individual oxygen atoms.

(a) photochemical

(b) thermochemical

(c) thermal

(d) ionic

The question was asked in an interview for internship.

The query is from Photochemical Reactions in division Photochemistry of Engineering Chemistry I

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The correct answer is (a) photochemical

To elaborate: Molecular oxygen undergoes photochemical dissociation into individual oxygen atoms. These oxygen atoms are reacted with molecular oxygen to form ozone.

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