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  9. Q48

TGPSC Group-I 2024 · Question 48 of 144

Sort the following steps in the correct order of photochemical smog production : A. Emission of NOx and VOCs. B. Ozone production due to the reaction between NO x and VOCs. C. Ozone reacts with other pollutants and forms NO2 and O2. D. Peroxy Acyl Nitrate (PAN) is produced by the reaction between NO 2 and hydrocarbons. Choose the correct order :

Environment

  1. AA, D, C, B
  2. BA, C, B, D
  3. CA, B, C, DCorrect
  4. DA, D, B, C

Answer: C. A, B, C, D

Explanation

Photochemical smog sequence: emission of NOx and VOCs → ozone formation → ozone reacting with pollutants → PAN formation — A, B, C, D.

Source: TGPSC Group-I Preliminary Test 2024 official question paper booklet (held 9 Jun 2024, TEST 224) with Preliminary Key (MASTER), via Adda247

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