Paper 1 · People, Development and Environment
Match List I (water quality) with List II (pH value): A. Neutral, B. Moderately acidic, C. Alkaline, D. Injurious; I. 5, II. 7, III. 4, IV. 8.
AA-II, B-III, C-I, D-IV
BA-I, B-III, C-II, D-IV
CA-II, B-I, C-IV, D-III ✓ Correct
DA-III, B-I, C-II, D-IV
Correct answer: (C) A-II, B-I, C-IV, D-III — The correct match is A-II, B-I, C-IV, D-III, so that is the answer.
Explanation
★The correct match is A-II, B-I, C-IV, D-III, so that is the answer.
★Neutral water has a pH of 7, so A goes with II.
★Moderately acidic water has a pH of about 5, so B goes with I.
★Alkaline water has a pH of about 8, so C goes with IV.
★Strongly injurious acidic water has a pH of about 4, so D goes with III.
★So the correct match is A-II, B-I, C-IV, D-III.
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