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State PCS PYQPrelims 2024

UPPCS · Question 108

Given below are two statements, one labelled as Assertion (A) and the other as Reason (R). Assertion (A): CO2, SO2 and NO2 gases get dissolved in rain water and produce acid rain. Reason (R): Atmospheric air is polluted due to high concentration of gases like carbon dioxide, sulphur dioxide and oxides of nitrogen. Select the correct answer using the code given below.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. (A) is false, but (R) is true
  3. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
  4. (A) is true, but (R) is false
Show answer & explanation

Answer: (C) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

Explanation

Both statements are true; R describes air pollution in general but does not explain the chemistry of acid formation stated in A. (Some keys accept 'a'; verify.)