Question

In the prevention of air pollution, the role of a scrubber is to remove:

• A. Particulate SO2
• B. Liquid SO2
• C. Gaseous SO2
• D. Liquid SO3

Hint:

Scrubbers are a critical component of air pollution control technologies.

Answer 1

The Correct Option is C

Scrubbers are air pollution control devices that play a crucial role in removing pollutants from industrial exhaust streams:

(A) Particulate SO₂ - Incorrect: SO₂ exists as a gas at normal conditions, not as particulate matter.

(B) Liquid SO₂ - Incorrect: Sulfur dioxide is only liquid under high pressure or low temperature conditions, not in typical industrial emissions.

(C) Gaseous SO₂ - Correct: Scrubbers are specifically designed to remove gaseous sulfur dioxide (SO₂) from flue gases through chemical reactions with alkaline slurries, typically forming calcium sulfite or sulfate.

(D) Liquid SO₃ - Incorrect: Sulfur trioxide (SO₃) typically reacts with water vapor to form sulfuric acid mist, not remaining as a liquid in exhaust streams.

The correct answer is (C) Gaseous SO₂, as scrubbers primarily target this major air pollutant from combustion processes through wet or dry scrubbing technologies.

Answer 2

Scrubbers are devices used in industrial settings to remove pollutants from exhaust gases. They are particularly effective at removing gaseous sulfur dioxide (SO₂) , a major contributor to acid rain and air pollution. The process involves chemical reactions or physical absorption to capture SO₂ before it is released into the atmosphere.

• (A): Incorrect because "particular SO₂" is vague and inaccurate.
• (B): Incorrect because liquid SO₂ is not the target pollutant.
• (C): Correct because scrubbers specifically target gaseous SO₂.
• (D): Incorrect because liquid SO₃ is not relevant here.