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प्रश्न
What are the factors which influence the adsorption of a gas on a solid?
Describe the factors which affect the adsorption of gases on solids.
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उत्तर
There are various factors that affect the rate of adsorption of a gas on a solid surface.
- Nature of the gas: Easily liquefiable gases such as NH3, HCl, etc., are adsorbed to a great extent in comparison to gases such as H2, O2, etc. This is because Van der Waal’s forces are stronger in easily liquefiable gases.
- 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.
- Effect of pressure: Adsorption is a reversible process and is accompanied by a decrease in pressure. Therefore, adsorption increases with an increase in pressure.
- Effect of temperature: Adsorption is an exothermic process. Thus, in accordance with Le-Chatelier’s principle, the magnitude of adsorption decreases with an increase in temperature.
संबंधित प्रश्न
Write the differences between physisorption and chemisorption with respect to the following:
(i) Specificity
(ii) Temperature dependence
(iii) Reversibility and
(iv) Enthalpy change
Distinguish between the meaning of the terms adsorption and absorption. Give one example of.
What is the difference between physisorption and chemisorption?
Write one similarity between Physisorption and Chemisorption
In physisorption, adsorption is generally ____________.
Extent of physisorption of a gas increases with ______.
Which of the following is not a favourable condition for physical adsorption?
In physisorption adsorbent does not show specificity for any particular gas because ______.
In which of the following reactions heterogenous catalysis is involved?
(a) \[\ce{2SO2 (g) + O2 (g) ->[NO(g)] 2SO3 (g)}\]
(b) \[\ce{2SO2 (g) ->[Pt(s)] 2SO3 (g)}\]
(c) \[\ce{N2 (g) + 3H2 (g) ->[Fe(s)] 2NH3 (g)}\]
(d) \[\ce{CH3COOCH3 (l) + H2O (l) ->[HCI(l)] CH3COOH (aq) + CH3OH (aq)}\]
Why is it important to have clean surface in surface studies?
Why do physisorption and chemisorption behave differently with rise in temperature?
Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.
In physical adsorption, gas molecules are bound on the solid surface by
A plot of 10 g (x/m) versus 10 g p for the adsorption of a gas on the surface of a solid gives a straight line with slope equal to:-
Adsorption play no role in:-
