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The smog is essentially caused by the presence of

  

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The smog is essentially caused by the presence of

(a) oxides of sulphur and nitrogen

(b) O2 and N2

(c) O2 and O3

(d) O3 and N2

1 Answer
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Correct answer: (a) oxides of sulphur and nitrogen

Explanation:

Smog is caused by oxides of sulphur and nitrogen.

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