Which of the following statement about multi-molecular colloid is incorrect?

1. They have a diameter of less than 1 nm.
2. When these particles are dissolved in a liquid, they form sol.
3. The molecules in the aggregate are held together by van der Waal’s forces of attraction.
4. None of the above.

Subtopic:  Colloidal Solution |
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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The phenomenon of the scattering of light by a colloidal solution known as:

1. Zeeman effect.

2. Tyndall effect.

3. Electrophoresis.

4. None of the above.

Subtopic:  Colloidal Solution |
 96%
From NCERT
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Correct statement about emulsion is:

1. The dispersed phase and dispersion medium are liquids.
2. The dispersed phase and dispersion medium are solids.
3. The dispersed phase and dispersion medium are gases.
4. The dispersed phase are solids and dispersion medium are liquids.
Subtopic:  Emulsions |
 88%
From NCERT
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The charge present on micelles is:

1. Negative charge.

2. Positive charge.

3. Both negative and positive charges.

4. None of the above.

Subtopic:  Emulsions |
 74%
From NCERT
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Heterogeneous catalysis is shown in:

1. \(2SO_{2}{(g)} \ + \ O_{2}{(g)} \ \xrightarrow[]{Pt(s)} \ 2SO_{3}{(g)}\)
2. \(4NH_{3}{(g)} \ + \ 3H_{2}{(g)} \ \xrightarrow[]{Fe(s)} \ 2NH_{3}{(g)}\)
3. \(Vegetable \ oil(l) \ + \ H_{2}(g) \ \xrightarrow[]{Ni(s)} \ Vegetable \ ghee(s)\)
4. All of the above

Subtopic:  Catalyst |
 84%
From NCERT
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Shape selective catalysis is:

1. Catalytic reaction depends upon the pore structure of the catalyst.
2. Catalytic reactions depend on the size of the reactant and the product molecules.
3. Both '1' and '2'
4. None of the above.
Subtopic:  Catalyst |
 91%
From NCERT
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Emulsions can be used as:

1. For cleansing action of soaps.

2. For digestion of fats in the intestines.

3. As antiseptics and disinfectants.

4. All of the above.

Subtopic:  Emulsions |
 89%
From NCERT
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The correct statements about micelles are:

1. Formed by substances such as soaps and detergents when dissolved in water.
2. Substances whose molecules contain a hydrophobic and a hydrophilic part.
3. Molecules whose hydrophobic parts are present towards the center, while the hydrophilic parts are pointing towards the outside.
4. All of the above.
Subtopic:  Emulsions |
 94%
From NCERT
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The correct statement about heterogeneous catalysis is :

1. The catalyst and reactants are present in different phases.
2. The catalyst and reactants are present in the same phase.
3. The products and reactants are present in different phases.
4. None of the above.

Subtopic:  Catalyst |
 86%
From NCERT
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