Question

Class - 12
Chemistry

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Q - Explain how the phenomenon of adsorption finds application in each of the following processes:
(i) Production of vacuum
(ii) Heterogeneous catalysis
(iii) Froth floatation process

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Answer 1

Answer:

(i) Proudction of vacuum : The adsorption of air in liquid air helps to create a high vaccum in a vessel. This process is used in high vaccum instruments as Dewar flask for storage of liquid air or liquid hydrogen. The remaining traces of air can be adsorbed by charcoal from the vessel evacuated by a vaccum pump to give a very high vaccum.

(ii) Heterogeneous catalysis : The phenomenon of adsorption is useful in the heterogeneous catalysis Adsorption of reactants on the solid surface of catalysts increases the rate of · reaction. The metals such as Fe, Ni, Pt, Pd, etc. are used in the manufacturing process.

(iii) Froth Floatation process : When sulphide one is shaken with pine oil and water t~e ore particles are adrorbed on the froth that floats and the gangue particles settle down m the tank.

Answer 2

Answer:

i) Production of high vacuum: Traces of air can be adsorbed by charcoal from a vessel, evacuated by a vacuum pump to give a very high vacuum. (ii)Heterogeneous catalysis is very important because it enables faster, large-scale production and the selective product formation. For example, the Haber–Bosch process uses metal-based catalysts in the synthesis of ammonia, an important component in fertilizer; 144 million tons of ammonia were produced in 2016.(iii) Froth floatation process: This process is used to remove gangue from sulphide ores. The basic principle involved in this process is adsorption.

• Explanation:
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