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Q. No.An adsorption isotherm is a plot between:
1.
The extent of adsorption \(({x \over m})\) against the pressure of gas (P) at constant V.
2.
The extent of adsorption \(({x \over m})\) against the pressure of gas (P) at constant T.
3.
The extent of absorption \(({x \over m})\) against the volume of gas (V) at constant P.
4.
The extent of absorption \(({x \over m})\) against the pressure of gas (P) at constant T.
Subtopic: Adsorption Isotherm |
80%
Level 1: 80%+
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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. |
Subtopic: Adsorption and Absorption |
89%
Level 1: 80%+
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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. |
Subtopic: Adsorption and Absorption |
81%
Level 1: 80%+
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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. |
Subtopic: Adsorption and Absorption |
75%
Level 2: 60%+
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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. |
Subtopic: Lyophilic & Lyophobic Sol |
72%
Level 2: 60%+
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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%
Level 1: 80%+
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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 |
95%
Level 1: 80%+
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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 |
87%
Level 1: 80%+
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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%
Level 2: 60%+
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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%
Level 1: 80%+
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