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Q. No.According to the adsorption theory of catalysis, the speed of the reaction increase because:
1.
The concentration of reactant molecules at the active centers of the catalyst becomes high due to adsorption
2.
In the process of adsorption, the activation energy of the molecules becomes large
3.
Adsorption produces heat which increases the speed of the reaction
4.
Adsorption lowers the activation energy of the reaction
Subtopic: Adsorption and Absorption |
From NCERT
AIPMT - 2003
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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An adsorption isotherm is a plot between:
| 1. | The extent of adsorption \(({x \over m})\) against the pressure of gas (P) at constant V. |
| 2. | The extent of adsorption \(({x \over m})\) against the pressure of gas (P) at constant T. |
| 3. | The extent of absorption \(({x \over m})\) against the volume of gas (V) at constant P. |
| 4. | The extent of absorption \(({x \over m})\) against the pressure of gas (P) at constant T. |
Subtopic: Adsorption Isotherm |
81%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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Hydrophobic sols are easily coagulated as?
| 1. | The particles present in them come closer and form aggregates, leading to precipitation. |
| 2. | The particles present in them move farther and form aggregates, which leads to precipitation. |
| 3. | The particles present in them come closer and do not form aggregates, leading to precipitation. |
| 4. | The particles present in them move farther and do not form aggregates, leading to precipitation. |
Subtopic: Lyophilic & Lyophobic Sol |
72%
From NCERT
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Enzymes are:
1. Biochemical catalysts.
2. Protein molecules of high molecular masses.
3. Both (1) and (2)
4. None of the above.
Subtopic: Catalyst |
92%
From NCERT
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