07. The p-BLOCK ELEMENTS (XII)
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The smog is essentially caused by the presence of
1 Oxides of sulphur and nitrogen
2 \({O_2}\) and \({N_2}\)
3 \({O_2}\)and \({O_3}\)
4 \({O_3}\) and \({N_2}\)
Explanation:
(a) Photochemical smog is caused by oxides of sulphur and nitrogen.