Choose the correct option(s) regarding physisorption and chemisorption:

Rate of physisorption is comparatively faster than chemisorption

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Rate of physisorption is comparitively slower than chemisorption

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Physisorption is more pronounced at lower temperatures.

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Physisorption does not vary with change in temperature.

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Solution

The correct option is C Physisorption is more pronounced at lower temperatures.

Property Physisorption
Chemisorption

Nature of adsorption Weak (van der Waals’ forces) Strong (Chemical bond formation)

Specificity of adsorption
Not specific Highly specific

Reversibility of adsorption Reversible Irreversible

Temperature at which adsorption is more pronounced
Low
temperature High temperature

Effect of change in temperature
Decreases with rise in temperature
Increases with rise in temperature

Enthalpy of adsorption
Low $(20 - 40) k J m o l^{- 1}$ High $(80 - 240) k J m o l^{- 1}$

Nature of adsorbate layer Multi-layered (at high pressure) Mono-layered

Energy of activation Low Significantly high

Rate Rapid/Fast
Slow

Suggest Corrections

Property	Physisorption	Chemisorption
Nature of adsorption	Weak (van der Waals’ forces)	Strong (Chemical bond formation)
Specificity of adsorption	Not specific	Highly specific
Reversibility of adsorption	Reversible	Irreversible
Temperature at which adsorption is more pronounced	Low temperature	High temperature
Effect of change in temperature	Decreases with rise in temperature	Increases with rise in temperature
Enthalpy of adsorption	Low $(20 - 40) k J m o l^{- 1}$	High $(80 - 240) k J m o l^{- 1}$
Nature of adsorbate layer	Multi-layered (at high pressure)	Mono-layered
Energy of activation	Low	Significantly high
Rate	Rapid/Fast	Slow