Photochemical smog is _ in characer while classical smog is _ in character.

oxidising, reducing

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reducing, oxidising

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oxidising, oxidising

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reducing, reducing

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Solution

The correct option is A oxidising, reducing
Photochemical smog is formed by the action of sunlight on unsaturated hydrocarbons and nitrogen oxides.
Photochemical smog is sometimes called as Oxidizing smog as it contains high concentrations of oxidizing agens like Ozone, $H N O_{3}$ whereas Classical Smog is called reducing smog as it contains high concentrations of sulphur dioxide, which is a reducing agent.
Hence correct option is a.

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