Question

Harmful gases such as SO$_2$ can be removed from the industrial exhaust using

• A. Catalytic convertor
• B. Electrostatic precipitator
• C. Earmuffs
• D. Scrubber

Hint:

• Gases → Scrubber
• Particles → Electrostatic precipitator

Answer 1

The Correct Option is D

Concept: Different pollution control devices are used for different types of pollutants:
• Gaseous pollutants (like SO$_2$) → removed using scrubbers
• Particulate matter → removed using electrostatic precipitators

Step 1: Understanding the mechanism.

• Scrubbers use liquid (often alkaline solution) to absorb and neutralize gases

Step 2: Analyzing options.

• Catalytic converter: Used in vehicles for NO$_x$, CO → Incorrect.
• Electrostatic precipitator: Removes solid particles → Incorrect.
• Earmuffs: Protect against noise → Incorrect.
• Scrubber: Removes SO$_2$ and other gases → Correct.

Step 3: Selecting the correct answer.
Thus, harmful gases like SO$_2$ are removed using scrubbers.