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Factors Affecting Adsorption

Which among t...

Question

Which among the following statement is false?
A. Chemisorption is reversible in nature
B. Particle size of adsorbent will not affect the amount of adsorption
C. Increase of pressure increases amount of adsorption
D. Increase of temperature always decreases the amount of adsorption

A

A,D

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B

A,B,D

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C

A

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D

All are false

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Solution

The correct option is B A,B,D
A. It is irreversible in nature because of the formation of new bonds.

B. Surface area of a powdered solid adsorbent depends on its particle size. Smaller the particle size, greater is its surface area and hence more is the extent of adsorption.

C. Correct statement

D. In case of chemisorption isobar, it first increases and then decreases with increase in temperature.

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Similar questions

Q. Which among the following statement is false?
A. Chemisorption is reversible in nature
B. Particle size of adsorbent will not affect the amount of adsorption
C. Increase of pressure increases amount of adsorption
D. Increase of temperature always decreases the amount of adsorption

Q. The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are):
(i) adsorption is always exothermic.

(ii) physisorption may transform into chemisorption at high temperature.
(iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature.
(iv) chemisorption is more exothermic than physisorption, however, it is very slow due to the higher energy of activation.

Q. Select the correct statement(s).
1. Adsorption is spontaneous at all the temperatures.
2. Gases having high critical temperature possess more tendency for adsorption.
3. An adsorbent possesses more tendency for adsorption if it is in colloidal state.
4. Chemical adsorption first decreases with increase in temperature and then increases.
5. Water molecules are adsorbed in

C a C l_{2} (s)

results in increasing temperature.

N_{2}

is adsorbed on iron surface at

83

K which decreases rapidly with increase in temperature and at room temperature, practically no adsorption of

N_{2}

occurs. The adsorption, however, becomes significant at

773

K. Reason: At lower temperature, adsorption of

N_{2}

molecules on iron surface is physisorption and at high temperatures,

N_{2}

shows chemisorption of

N

atoms on iron surface.

x

is amount of adsorbate and

m

is amount of adsorbent, which of the following relations is not related to adsorption process?

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Factors Affecting Adsorption

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