Chemistry - Environmental Chemistry Question with Solution | TestHub

The incorrect statement is D. Photochemical smog typically occurs during the day, especially in warm, sunny conditions, while classical smog (London smog) is more prevalent in cool, humid conditions, often in the early morning or late evening.

Option A is correct: Classical smog is a mixture of smoke, fog, and sulfur dioxide ($S{O}_2$).

Option B is correct: Photochemical smog is an oxidizing smog due to the presence of oxidants like ozone ($O_3$) and peroxyacetyl nitrate (PAN).

Option C is correct: High concentrations of $S{O}_2$ can indeed cause stiffness and premature shedding of flower buds.