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Q. No. The process of chemisorption is :
1. Highly specific in nature.
2. Dependent on the surface area of the adsorbent.
3. Not specific in nature.
4. Both (1) and (2)
1. Highly specific in nature.
2. Dependent on the surface area of the adsorbent.
3. Not specific in nature.
4. Both (1) and (2)
Subtopic: Adsorption and Absorption |
87%
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Given below are two statements:
| Assertion (A): | Physisorption decrease with the increase in temperature. |
| Reason (R): | Physisorption is exothermic in nature. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Adsorption and Absorption |
69%
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Given below are two statements:
| Assertion (A): | Powdered substances are more effective adsorbents than their crystalline forms |
| Reason (R): | Powdered substance has more surface area and the extent of adsorption increases with the increase of the surface area of the adsorbent. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Adsorption and Absorption |
94%
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It is necessary to remove CO when ammonia is obtained by Haber’s process because-
| 1. | CO reacts with N2 and decreases the rate of reaction. |
| 2. | CO reacts with H2 and decreases the rate of reaction |
| 3. | CO adversely affects the activity of the iron catalyst |
| 4. | CO reacts with ammonia and decreases the rate of reaction. |
Subtopic: Catalyst |
58%
From NCERT
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The ester hydrolysis remains slow in the beginning and becomes faster after sometime, because :
1. Acid produced in the reaction acts as an auto-catalyst.
2. Acid produced in the reaction acts as a poison.
3. Alcohol acts as a negative catalyst in the reaction.
4. Both (2) and (3)
1. Acid produced in the reaction acts as an auto-catalyst.
2. Acid produced in the reaction acts as a poison.
3. Alcohol acts as a negative catalyst in the reaction.
4. Both (2) and (3)
Subtopic: Catalyst |
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The role of desorption in the process of catalysis is to :
1. Slower the rate of reaction.
2. Make the surface of solid catalyst free.
3. Increase the temperature of reaction.
4. Decrease the availabilty of surface for reactants.
1. Slower the rate of reaction.
2. Make the surface of solid catalyst free.
3. Increase the temperature of reaction.
4. Decrease the availabilty of surface for reactants.
Subtopic: Adsorption and Absorption |
66%
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According to Hardy-Schulze law :
| 1. | Polarising power of flocculating ion is directly proportional to its power to cause precipitation. |
| 2. | Valence of flocculating ion is directly proportional to its power to cause precipitation. |
| 3. | Polarising power of flocculating ion is inversely proportional to its power to cause precipitation. |
| 4. | Both (1) and (2) |
Subtopic: Colloidal Solution |
73%
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It is essential to wash the precipitate with water before estimating it quantitatively . It is done to:
1. Make volatile product with solution.
2. Make it soluble in the solution.
3. Remove the adsorbed ions.
4. All of the above.
1. Make volatile product with solution.
2. Make it soluble in the solution.
3. Remove the adsorbed ions.
4. All of the above.
Subtopic: Colloidal Solution |
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