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Q. No.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%
Level 2: 60%+
NEET - 2022
Hints
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 |
66%
Level 2: 60%+
NEET - 2022
Hints
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 |
52%
Level 3: 35%-60%
NEET - 2022
Hints
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 |
68%
Level 2: 60%+
NEET - 2022
Hints
Which one is an example of heterogeneous catalysis?
| 1. | Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron. |
| 2. | Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen. |
| 3. | Hydrolysis of sugar catalysed by H+ ions. |
| 4. | Decomposition of ozone in presence of nitrogen monoxide. |
Subtopic: Catalyst |
53%
Level 3: 35%-60%
NEET - 2023
Hints
Subtopic: Colloidal Solution |
61%
Level 2: 60%+
NEET - 2023
Hints
Which of the following is a positively charged sol?
1. Methylene blue sol
2. Congo red sol
3. Siver sol
4. \(Sb_2S_3 ~sol\)
1. Methylene blue sol
2. Congo red sol
3. Siver sol
4. \(Sb_2S_3 ~sol\)
Subtopic: Colloidal Solution |
50%
Level 3: 35%-60%
NEET - 2023
Hints
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%
Level 2: 60%+
NEET - 2021
Hints
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 |
Level 4: Below 35%
AIPMT - 2003
Hints
Which statement is not correct regarding the adsorption of a gas on the surface of a solid:
| 1. | On increasing temperature adsorption increase continuously |
| 2. | Enthalpy & entropy change is negative |
| 3. | Adsorption is more for some specific substance |
| 4. | Reversible |
Subtopic: Adsorption and Absorption |
75%
Level 2: 60%+
AIPMT - 2001
Hints
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