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 |
 58%
From NCERT
NEET - 2023
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Pumice stone is an example of- 
1. foam  2. sol 
3. gel  4. solid sol 
Subtopic:  Colloidal Solution |
 62%
From NCERT
NEET - 2023
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Which of the following is a positively charged sol? 
1. Methylene blue sol 
2. Congo red sol 
3. Siver sol 
4. \(Sb_2S_3 ~sol\)
Subtopic:  Colloidal Solution |
 59%
From NCERT
NEET - 2023
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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 |
 80%
From NCERT
NEET - 2022
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Given below are two statements:
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
In the light of the above statements, choose the most appropriate answer from the options given below:
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 |
 69%
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 |
 54%
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
Subtopic:  Adsorption and Absorption |
 70%
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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Measuring Zeta potential is useful in determining which of the following property of a colloidal solution:

1. Solubility.

2. Stability of the colloidal particles.

3. Size of the colloidal particles.

4. Viscosity.

Subtopic:  Colloidal Solution |
 78%
From NCERT
NEET - 2020
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In which of the sols, the colloidal particles are with a negative charge?

1. TiO2

2. Hemoglobin

3. Starch

4. Hydrated Al2O3

Subtopic:  Colloidal Solution |
 53%
From NCERT
NEET - 2020
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