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In the case of chemisorption, why adsorp...

In the case of chemisorption, why adsorption first increases and then decreases with temperature?

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Chemisorption or chemical adsorption invlves the formation of bonds between the gaseous molcules/atoms (adsorbte) and to adsorbent. This requires specific activation energy which is normally quite high. Therefore, chemisorption is often eferred to as activated adsorption.
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Assertion :- In case of chemical adsorption, (x)/(m) first increase then decrease with temp. Reason :- The intial increase is due to the fact that heat supplied acts as a activation energy. The decrease afterwards is due to the exothermic nature of adsorption at equilibrium.

Which of the following statements is not true? a. Both physisorption and chemisorption are exothermic. b. Physisorption occurs with increase of free energy. c. Physisorption requires low activation energy but chemisorption requires high activation energy. d. The magnitude of chemisorption increases and that of physisorption decreases with rise in temperature.

The correct statements pertaining to the adsorption of a gas on a solid surface are (i) Adsorption is always exothermic (ii) Physisorption may transform into chemisorption at high temperature (iii) Physisorption increases with increasing temperature but chemisorotion decrease with increasing temperature (iv) Chemisorption is more exothermic than physisoption, however, it is very slow due to higher energy of activation

Yhe rate of chemisorption a. increaeses with decreases in temperature b. increases with increasesin tempreture c. increases with decreases in the pressure of gas d. is independent of the pressure of gas

How physical adsorption will be effected by increase in temperature

DINESH PUBLICATION-SURFACE CHEMISTRY -SHORT ASNWER TYPE QUESTIONS
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