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Get,detailed solutions to the questions of the chapter **Surface Chemistry **from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking scheme.**Cbse.jagranjosh.com** provided you NCERT solutions for classes 12^{th} math and science subjects.

**Some questions of this chapter are given here **

**Q. Give reason why a finely divided substance is more effective as an adsorbent.**

**Answer**

A finely divided substance has a large surface area. We know that adsorption is asurface phenomenon & is directly proportional to the surface area. Whether adsorption is physisorption or chemisorption, it increases with an increase in thesurface area. Thus, a finely divided substance behaves as a good adsorbent.**Q. What are the factors which influence the adsorption of a gas on a solid?****Answer**

The factors which affect the rate of adsorption of a gas on a solid surface are:

a) Nature of the gas: The gases which are easily liquefiable for example- HCl,NH_{3} etc. are adsorbed to a great extent as compared to gases such as O_{2}, H_{2}

etc. This happens because Vander Waal’s forces are stronger in easilyliquefiable gases.

**b) Surface area of the solid:** The greater the surface area of the adsorbent, the greater is the adsorption of a gas on the solid surface.

**c) Effect of pressure: **Adsorption increases with an increase in pressure becauseadsorption is a reversible process and is accompanied by a decrease in pressure.

**d) Effect of temperature: **Adsorption is an exothermic process. Thus, according to Le-Chatelier’s principle, the adsorption decreases with an increase in temperature.

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