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GATE 2024 CE (CE2) – Question 25

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

What is the CORRECT match between the air pollutants and treatment techniques given in the table?

Air pollutantsTreatment techniques
P - NO$_2$i - Flaring
Q - SO$_2$ii - Cyclonic separator
R - COiii - Lime scrubbing
S - Particlesiv - NH$_3$ injection
  1. P-i, Q-ii, R-iii, S-iv
  2. P-ii, Q-i, R-iv, S-iii
  3. P-ii, Q-iii, R-iv, S-i
  4. P-iv, Q-iii, R-i, S-ii

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Correct answer: (D) P-iv, Q-iii, R-i, S-ii

Explanation

Nitrogen oxides are reduced by injecting ammonia (selective reduction), SO₂ is removed by scrubbing with lime, carbon monoxide is burnt off by flaring, and particles are collected in a cyclone. So P-iv, Q-iii, R-i, S-ii.