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i. Catalysis (Heterogeneous catalysis) :
- The solid catalysts are used in many industrial manufacturing processes.
- For example, iron is used as a catalyst in manufacturing of ammonia, platinum in manufacturing of sulphuric acid, H2SO4 (by contact process) while finely divided nickel is employed as a catalyst in hydrogenation of oils.
ii. Gas masks :
- It is a device which consists of activated charcoal or mixture of adsorbents.
- It is used for breathing in coal mines to avoid inhaling of the poisonous gases.
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