Activated charcoal is used in gas masks for military and industrial purposes because:

it adsorbs harmful gases

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it acts as a reducing agent

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it burns without smoke

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it is active

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Solution

The correct option is A it adsorbs harmful gases
Activated charcoal is good adsorbent. It absorbs harmful gases. So it is used in gas masks for the military and industrial purpose to adsorb harmful gases. Mainly gas like $S O_{2}$ and poisonous gases are adsorbed.

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