Which of the following statement is false?
1. | Adsorption is a reversible process and is accompanied by a decrease in pressure. |
2. | Adsorption decreases with an increase in pressure. |
3. | Adsorption is an exothermic process. |
4. | The magnitude of physisorption adsorption decreases with an increase in temperature. |
Hydrophobic sols are easily coagulated as?
1. | The particles present in them come closer and form aggregates, leading to precipitation. |
2. | The particles present in them move farther and form aggregates, which leads to precipitation. |
3. | The particles present in them come closer and do not form aggregates, leading to precipitation. |
4. | The particles present in them move farther and do not form aggregates, leading to precipitation. |
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. |
Enzymes are:
1. Biochemical catalysts.
2. Protein molecules of high molecular masses.
3. Both (1) and (2)
4. None of the above.
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.
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. |
The charge present on micelles is:
1. Negative charge.
2. Positive charge.
3. Both negative and positive charges.
4. None of the above.
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 |
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. |
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.