The factors that influence the adsorption of a gas on a solid is/are:

1. Nature of the gas.

2. Surface area of the solid.

3. Effect of pressure.

4. All of the above.

Subtopic:  Adsorption and Absorption |
 95%
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Adsorbent can be activated by:

1. Increasing the surface area of the adsorbent.
2. Breaking adsorbent into smaller pieces or powdering it.
3. Both (1) and (2)
4. None of the above.

Subtopic:  Adsorption and Absorption |
 89%
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Why is a finely divided substance more effective as an adsorbent?

1. Small surface area.

2. Large surface area.

3. Weak molecular bonding.

4. Strong molecular bonding.

Subtopic:  Adsorption and Absorption |
 85%
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The probable reasons of the exothermic nature of adsorption is:

1. Adsorption leads to a decrease in the residual forces on the surface of the adsorbent.
2. ∆S is negative.
3. Both (1) and (2) 
4. None of the above.

Subtopic:  Adsorption and Absorption |
 81%
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The characteristics associated with adsorption are:

1. ∆G, ∆H, and ∆S are all negative.
2. ∆G and ∆H are negative, but ∆S is positive.
3. ∆G and ∆S are negative, but ∆H is positive.
4. ∆G is negative, but ∆H and ∆S are positive.

Subtopic:  Adsorption and Absorption |
 81%
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On increasing the temperature:

1. The extent of adsorption increases in physisorption.

2. The extent of adsorption decreases in physisorption.

3. No effect on adsorption.

4. The extent of adsorption first decreases, then increases.

Subtopic:  Adsorption and Absorption |
 80%
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Incorrect statement regarding adsorption is:

1. Adsorption is a surface phenomenon of accumulation of molecules of a substance at the surface rather than in the bulk of a solid or liquid.
2. Adsorption involves penetration through the surface to the bulk of the solid or liquid.
3. The substance that gets adsorbed is called the ‘adsorbate’ and the substance on whose surface the adsorption takes place is called the ‘adsorbent’.
4. During absorption, the substance gets uniformly distributed throughout the bulk of the solid or liquid.
Subtopic:  Adsorption and Absorption |
 80%
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Which of the following statement is false?

1. Adsorption is a reversible process and is accompanied by a decrease in pressure.
2. Adsorption decreases with an increase in pressure.
3. Adsorption is an exothermic process.
4. The magnitude of physisorption adsorption decreases with an increase in temperature.

Subtopic:  Adsorption and Absorption |
 75%
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Water vapours can be both adsorbed and absorbed by respectively ?

1. Silica gel and CaCl2

2. Chalk and CaCl2

3. CaCl2 and Silica gel

4. CaCl2 and Chalk

Subtopic:  Adsorption and Absorption |
 71%
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Which ion is adsorbed when a diluted aqueous solution of AgNO3 (excess) is added to KI solution, resulting in formation of positively charged sol particles of AgI?

1. K+

2. Ag+

3. I-

4. NO3-

Subtopic:  Adsorption and Absorption |
 65%
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