Advertisements
Advertisements
Questions
Give reasons for the following observations:
Physisorption decreases with increase in temperature.
Why does physisorption decrease with the increase of temperature?
Solution
Physisorption is exothermic in nature:
\[\ce{\underset{(Adsobent) (Adsobate)}{Solid + Gas}⇌\underset{(Gas adsorbed on solid)}{Gas/Solid + Heat}}\]
In accordance with Le Chatelier’s principle, physisorption decreases with an increase in temperature. Because the equilibrium will shift in the backward direction, gas will be released from the adsorbed surface.
RELATED QUESTIONS
Write any two characteristics of Chemisorption.
Why are powdered substances more effective adsorbents than their crystalline forms?
Distinguish between the meaning of the terms adsorption and absorption. Give one example of.
Give reason why a finely divided substance is more effective as an adsorbent.
Write one similarity between Physisorption and Chemisorption
Physisorption is reversible while chemisorption is irreversible. Why ?
Answer in one sentence:
Name type of adsorption in which the compound is formed.
Which of the following compounds is formed when tungsten adsorbs oxygen gas?
Which of the following is true about chemisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Extent of physisorption of a gas increases with ______.
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) \[\ce{CH3COOCH3 (l) + H2O (l) ->[HCI(l)] CH3COOH (aq) + CH3OH (aq)}\]
What is the role of activated charcoal in gas mask used in coal mines?
Assertion: Detergents with low CMC are more economical to use.
Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.
What is the role of adsorption in heterogenous catalysis?
Write three differences between Physisorption and Chemisorption.
Assertion A : Activated charcoal adsorbs SO2 more efficiently than CH4.
Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal.
In light of the above statements, choose the correct answer from the options given below.
Which of the following statements is incorrect regarding physisorptions?
