Chemisorption
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The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)
Adsorption is always exothermic.
Physisorption may transformation into chemisorption at high temperature.
Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature.
Chemisorption is more exothermic than physisorption; however, it is very slow due to higher energy of activation.
How many layers are adsorbed in chemical adsorption?
- One
- Two
- Many
- Zero
The rate of chemisorption :
- increases with increase of pressure
- is independent of pressure
- is independent of temperature
- decreases with increase of pressure


- I is physisorption and II is chemisorption
- I is physisorption and III is chemisorption
- IV is chemisorption and II is chemisorption
- IV is chemisorption and III is chemisorption
Chemisorption
Remains unaffected by change of temperature
Either increases or decreases with temperature
Increases with temperature
Decreases with temperature
Chemisorption
Decreases with increase of temperature
- Involves multilayer formation of adsorbent on adsorbate
Is irreversible in nature
Involves the weak attractive interactions between adsorbent and adsorbate
1 g charcoal adsorbs 100 ml of 0.5 M CH3CHOOH to form a monolayer. As a result molarity of acetic acid reduces to 0.49 M. What will be the surface area covered by each molecule of acetic acid? Given that surface area of charcoal =3.01×102m2/g.
- 2.5 × 10-19 m2
- 5.0 × 10-19 m2
- 10–18 m2
- 2.0 × 10-18 m2
Enthalpy of chemisorption is in the order of?
20 - 40 kJ per mol
80 - 240 kJ per mol
30 - 1000 kJ per mol
40 - 80 kJ per mol
- Increases with an increase in temperature
- Decreases with an increase in temperature
- First increases, then decreases with an increase in temperature
- First decreases, then increases with an increase in temperature
- O2 is physisorbed
- Heat is released
- Occupancy of π∗2px O2 is increased
- Bond length of O2 is increased