Q. No.Adsorbent can be activated by:
1.
Increasing the surface area of the adsorbent.
2.
Breaking adsorbent into smaller pieces or powdering it.
3.
Both (1) and (2)
4.
None of the above.
The probable reasons of the exothermic nature of adsorption is:
| 1. | Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. |
| 2. | ∆S is negative. |
| 3. | Both (1) and (2) |
| 4. | None of the above. |
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. |
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 |
Identify the correct statement -
1. The activity of a catalyst is its ability to increase the rate of a particular reaction.
2. Chemisorption is the main factor in deciding the activity of a catalyst.
3. The catalysts are selective in nature
4. All of the above.
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