Smog is formed near the ground in the troposphere.
Nitrogen oxides impart yellow-brown colour to smog.
Photochemical somg formation is maximum when sun is overhead in the day.
Photochemical smog formation is maximum in winter compared to summer season.
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The Correct Option isD
Solution and Explanation
Step 1: Understanding the Question:
We must pick the statement that is wrong. The passage says smog forms in the lowest part of the atmosphere, is dirty yellow-brown, and the Los Angeles type forms by reactions that need sunlight.
Step 2: Key Approach:
Photochemical smog is driven by sunlight acting on nitrogen oxides and hydrocarbons. So anything that links its peak to weak sunlight is suspect.
Step 3: Check option (1).
Smog is described as a cloudy layer in the lower troposphere near the ground. So option (1) is TRUE.
Step 4: Check option (2).
Nitrogen dioxide is a brown gas. It gives the haze its yellow-brown tint. So option (2) is TRUE.
Step 5: Check option (3).
Sunlight is strongest when the sun is overhead around noon. The photochemical reactions run fastest then, so the smog level peaks. So option (3) is TRUE.
Step 6: Check option (4).
Winter has weaker, shorter sunlight, so the photochemical reactions are slower. Peak formation is in summer, not winter. So option (4) is FALSE.
Final Answer:
Only option (4) is incorrect, so the answer is option 4.
\[ \boxed{4} \]
