Advertisements
Advertisements
प्रश्न
Why are powdered substances more effective adsorbents than their crystalline forms?
Advertisements
उत्तर
Powdered substances are more effective adsorbents than their crystalline forms because when a substance is powdered, its surface area increases and physisorption is directly proportional to the surface area of the adsorbent
संबंधित प्रश्न
Give reasons for the following observations:
Physisorption decreases with increase in temperature.
Why is adsorption always exothermic?
Write any two characteristics of chemisorption.
What is the difference between physisorption and chemisorption?
Give reason why a finely divided substance is more effective as an adsorbent.
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 is true about chemisorption?
Which among the following is a property of physisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
The extent of adsorption increases with the ____________.
The physical adsorption is due to ____________.
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) \[\ce{CH3COOCH3 (l) + H2O (l) ->[HCI(l)] CH3COOH (aq) + CH3OH (aq)}\]
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?
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:-
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.
