# The factors that influence the adsorption of a gas on a solid is/are: 1. Nature of the gas. 2. Surface area of the solid. 3. Effect of pressure. 4. All of the above.

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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.
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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.

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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.

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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 |
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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 |
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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 |
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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 |
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The correct match amongst the following is -

 Physical states of the dispersed phase and dispersion medium Type of colloid a. D.P = solid; D.M = liquid i. Foam b. D.P = solid; D.M = gas ii. Emulsion c. D.P = liquid; D.M = liquid iii. Aerosol d. D.P = gas; D.M = liquid iv. Sol

(D.P = dispersed phase, and D.M = dispersion medium)

Options:

 a b c d 1. iv iii ii i 2. iii iv ii i 3. iv ii iii i 4. i iii ii iv
Subtopic:  Colloidal Solution |
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The graph between $\mathrm{log}\frac{\mathrm{x}}{\mathrm{m}}$ vs log p is given below:

What is the value of the slope?

1. ${\left(\frac{1}{2}\right)}^{\mathrm{n}}$

2. n

3. $\frac{1}{\mathrm{n}}$

4.$\frac{1}{{\left(\mathrm{n}\right)}^{2}}$