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Chemisorption

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Out of physisorption and chemisorption which on has lower enthalpy of adsorption?

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Solution

Physisorption has lower enthalpy of adsorption as it involves weak van der waals forces of attraction.
Chemisorption involves strong chemical forces equivalent to chemical bonds.

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Q. Which among physisorption and chemisorption has a higher enthalpy of adsorption?

Q. Of physisorption or chemisroption, which has a higher enthalpy of adsorption?

Adsorption isobars of chemisorption and physisorption are of the same type.

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.

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.

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