Question

Which of the following is used in making gas masks/ filters used in coal mines?

• A. Plant Charcoal
• B. Animal Charcoal
• C. Activated charcoal
• D. Any of the above

Answer 1

Answer: (C)

Activated charcoal

When plant charcoal is treated with ${\text{ZnCl}}_2$, microscopic holes are created in it. This charcoal is called as activated charcoal. The small pores in activated charcoal can filter out poisonous gases like ammonia and hence it is used in making gas masks/ filters used in coal mines.