Objective Type Questions \( \mathrm{P} \) Which one of the followin...
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Objective Type Questions
\( \mathrm{P} \)
Which one of the following is not a property of classical smog?
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(1) Occurs at low temperature
(2) Secondary pollutant play significant role
(3) Contains \( \mathrm{SO}_{2} \)
(4) Dark brown coloured
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