Question

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

Air Pollutants		Treatment techniques
P	NO2	i	Flaring
Q	SO2	ii	Cyclonic separator
R	CO	iii	Lime scrubbing
S	Particles	iv	NH3 injection

• A. P-i, Q-ii, R-iii, S-iv
• B. P-ii, Q-i, R-iv, S-iii
• C. P-ii, Q-iii, R-iv, S-i
• D. P-iv, Q-iii, R-i, S-ii

Answer 1

The Correct Option is D

To find the correct match between the air pollutants and the treatment techniques, we need to understand the common treatment methods for each type of pollutant.

1. NO₂ (Nitrogen Dioxide): This is typically treated using techniques such as selective catalytic reduction or ammonia injection. Thus, NO₂ is best matched with NH₃ injection (iv).
2. SO₂ (Sulfur Dioxide): This pollutant is often treated using lime scrubbing or other forms of scrubbing. Therefore, SO₂ is best matched with Lime scrubbing (iii).
3. CO (Carbon Monoxide): It is commonly treated through flaring, where the gas is burned off. Thus, CO should be matched with Flaring (i).
4. Particles: Particulate matter is effectively removed using cyclonic separators, which use centrifugal forces to separate particles. Hence, Particles are best matched with Cyclonic separator (ii).

Therefore, the correct match according to the air pollutants and treatment techniques is:

• P (NO₂) - iv (NH₃ injection)
• Q (SO₂) - iii (Lime scrubbing)
• R (CO) - i (Flaring)
• S (Particles) - ii (Cyclonic separator)

The correct answer is thus: P-iv, Q-iii, R-i, S-ii.