At the equilibrium position in the process of adsorption ..........

1.   ΔH > 0

2.   ΔH = TΔS

3.   ΔH > TΔS

4.   ΔH < TΔS

Subtopic:  Adsorption and Absorption |
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The process that does not occur at the interface of phases is :

1.  Crystallisation

2.  Heterogeneous catalysis

3.  Homogeneous catalysis

4.  Corrosion

 

 
Subtopic:  Catalyst |
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The interface that cannot be obtained is 

1. Liquid-liquid

2. Solid-liquid

3. Liquid-gas

4. Gas-gas

 
Subtopic:  Adsorption and Absorption | Catalyst | Lyophilic & Lyophobic Sol |
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The term ‘sorption’ stands for.........

1.  Absorption

2.  Adsorption 

3.  Both absorption and adsorption

4.  Desorption

 
Subtopic:  Adsorption and Absorption |
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Extent of adsorption of adsorbate from the solution phase increases with:
1. Increase in amount of adsorbate in solution.
2. Decrease in surface area of adsorbent.
3.  Increase in temperature of solution.
4. Decrease in amount of adsorbate in solution.

Subtopic:  Adsorption and Absorption |
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Which one of the following is not applicable to the phenomenon of adsorption?

1.     Δ H > 0 2.     Δ G < 0 3.    Δ S < 0 4.     Δ H < 0  

 
Subtopic:  Adsorption and Absorption |
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Physical adsorption is not favoured by : 

1. High pressure.

2. Negative H

3. Higher critical temperature of adsorbate.

4. High temperature.

 
Subtopic:  Adsorption and Absorption |
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Extent of physisorption of a gas increases with ......

1. Increase in temperature.

2. Decrease in temperature.

3.  Decrease in surface area of adsorbent.

4.  Decrease in strength of van der Waals’ force. 

Subtopic:  Adsorption and Absorption |
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Freundlich adsorption isotherm is given by the expression xm=kp1n Which of the following conclusions can be drawn from this expression?

(a) When 1n=0, the adsorption is independent of pressure
(b) When 1n=0, the adsorption is directly proportional to pressure
(c) When n =0, \(x\over m\)vs p graph is a line parallel to x-axis
(d) When n = 0, plot of  xm vs p is a curve
 

The correct choice among the given is -
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (c)

Subtopic:  Adsorption Isotherm |
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H2 gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to -

a.  Very strong van der Waals’ interaction

b.  Very weak van der Waals’ forces

c.  Very low critical temperature

d.  Very high critical temperature

The correct choice among the given is -

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Subtopic:  Adsorption and Absorption |
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