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Q. No.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)
Subtopic: Catalyst |
74%
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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%
From NCERT
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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%
From NCERT
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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 |
From NCERT
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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%
From NCERT
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The incorrect statement regarding enzymes is:
| 1. | Enzymes are very specific for a particle reaction and substrate. |
| 2. | Enzymes are biocatalysts. |
| 3. | Like chemical catalysts, enzymes reduce the activation energy of bio processes. |
| 4. | Enzymes are polysaccharides. |
Subtopic: Catalyst |
79%
From NCERT
NEET - 2022
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Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | In the coagulation of a negative sol, the flocculating power of the three given ions is in the order Al3+ > Ba2+ > Na+ |
| Statement II: | In the coagulation of a positive sol, the flocculating power of the three given salts is in the order NaCl > Na2SO4 > Na3PO4 |
| 1. | I is incorrect but II is correct. |
| 2. | Both I and II are correct. |
| 3. | Both I and II are incorrect. |
| 4. | I is correct but II is incorrect. |
Subtopic: Colloidal Solution |
67%
From NCERT
NEET - 2022
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Match List-I with List-II:
| List-I (Example of Colloidal systems) |
List-II (Nature of dispersion medium and dispersed phase) |
| (a) Insecticide spray | (i) Dispersion medium - liquid Dispersed phase - solid |
| (b) Whipped cream | (ii) Dispersion medium - gas Dispersed phase - liquid |
| (c) Paint | (iii) Dispersion medium - liquid Dispersed phase - liquid |
| (d) Hair cream | (iv) Dispersion medium - liquid Dispersed phase -gas |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iv) | (i) | (iii) |
| 2. | (iv) | (ii) | (iii) | (i) |
| 3. | (ii) | (iv) | (iii) | (i) |
| 4. | (iv) | (ii) | (i) | (iii) |
Subtopic: Colloidal Solution |
53%
From NCERT
NEET - 2022
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Shown below are adsorption isotherms for a gas 'X' at temperatures T1 , T2 and T3 :
p and \(\frac xm\) represent pressure and extent of adsorption, respectively. The correct order of temperatures for the given adsorption is:
1. T1 > T2 > T3
2. T3 > T2 > T1
3. T1 = T2 = T3
4. T1 = T2 > T3
p and \(\frac xm\) represent pressure and extent of adsorption, respectively. The correct order of temperatures for the given adsorption is:
1. T1 > T2 > T3
2. T3 > T2 > T1
3. T1 = T2 = T3
4. T1 = T2 > T3
Subtopic: Adsorption and Absorption |
69%
From NCERT
NEET - 2022
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The right option for the statement "Tyndall effect is exhibited by", is:
1. Starch solution
2. Urea solution
3. NaCl solution
4. Glucose solution
Subtopic: Colloidal Solution |
65%
From NCERT
NEET - 2021
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