ï»¿ How do the surface molecules have the tendency of adsorption? from Chemistry Surface Chemistry Class 12 Nagaland Board

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How do the surface molecules have the tendency of adsorption?

The molecules present on the surface of the liquid or solid experience unequal downward pull by bulk molecules and thus have strain 08 tension. This strain or tension is responsible for attracting and retaining the molecules on their surface.
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In Haber's process, hydrogen is obtained by reacting methane with steam in presence of NiO as catalyst. The process is known as steam reforming. Why is it necessary to remove CO when ammonia is obtained by Haber’s process?

Presence of CO in the synthesis of ammonia by Haber’s process adversely affects the activity of iron catalyst.
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Why are powdered substances more effective adsorbents than their crystalline forms?

Powderded substance are more effective adsorbent than their crystalline forms because when a substance is powdered its surface area increase and physisorption is directly proportional to the surface area of adsorbent,
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Why is the ester hydrolysis slow in the beginning and becomes faster after sometime?

Ester + water ---> Acid + Alcohal
The acid produced in the reaction acts as a catalysis and makes the reaction faster.

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Why does physisorption decrease with the increase of temperature?