Q. No.Water vapours can be both adsorbed and absorbed by respectively ?
1. Silica gel and
2. Chalk and
3. and Silica gel
4. and Chalk
Incorrect statement regarding adsorption is:
| 1. | Adsorption is a surface phenomenon of accumulation of molecules of a substance at the surface rather than in the bulk of a solid or liquid. |
| 2. | Adsorption involves penetration through the surface to the bulk of the solid or liquid. |
| 3. | The substance that gets adsorbed is called the ‘adsorbate’ and the substance on whose surface the adsorption takes place is called the ‘adsorbent’. |
| 4. | During absorption, the substance gets uniformly distributed throughout the bulk of the solid or liquid. |
The characteristics associated with adsorption are:
1. ∆G, ∆H, and ∆S are all negative.
2. ∆G and ∆H are negative, but ∆S is positive.
3. ∆G and ∆S are negative, but ∆H is positive.
4. ∆G is negative, but ∆H and ∆S are positive.
Among the following options, the gas that will be more readily adsorbed on the surface of charcoal is:
1.
2.
3.
4.
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. |
On increasing the temperature:
1. The extent of adsorption increases in physisorption.
2. The extent of adsorption decreases in physisorption.
3. No effect on adsorption.
4. The extent of adsorption first decreases, then increases.
Why is a finely divided substance more effective as an adsorbent?
1. Small surface area.
2. Large surface area.
3. Weak molecular bonding.
4. Strong molecular bonding.
Consider the following graph between (extent of adsorption) and pressure:
What is the correct relation between T1, T2, and T3?
1. T3 < T2 > T1
2. T1 < T2 < T3
3. T1 > T2 > T3
4. None of the above
KClO3 on heating decomposes into KCl and O2. If some MnO2 is added, the reaction goes much faster because:
1. MnO2 decomposes to give oxygen.
2. MnO2 provides heat by reacting.
3. Better contact is provided by MnO2
4. MnO2 acts as a catalyst.
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 |
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