Which of the following statement(s) is/are correct? (i) Classical smog is a mixture of smoke, fo...

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Which of the following statement(s) is/are correct?
(i) Classical smog is a mixture of smoke, fog and sulphur dioxide.
(ii) Classical smog is also called oxidising smog
(iii) Hydrocarbons, \( \mathrm{NO}_{2} \) and PAN are components of photochemical smog.
(a) (i) and (iii)
(b) (i) and (ii)
(c) (iii) only
(d) (i), (ii) and (iii)
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