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Question

Choose the correct option to replace the quotation part of each sentence. Often visible as smog, 'ozone is formed in the atmosphere from' hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.

ozone is formed in the atmosphere from

ozone is formed in the atmosphere when

ozone is formed in the atmosphere, and when

ozone, formed in the atmosphere when

None of these

ANS : 2

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