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Physisorption

how do physis...

Question

how do physisorption and chemisorption vary with temperature?

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Solution

Rate of physisorption decreases with increase in temperature.
Rate of chemisorption increase with increase in temperature.

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How does physisorption change to chemisorption at high temperatures?

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. Write the differences between physisorption and chemisorption with respect to the following:
(i) Specificity (ii) Temperature dependence (iii) Reversibility and (iv) Enthalpy change

Q. Assertion :Physisorption of a gas adsorbed at low temperature may change into chemisorption at a high temperature. Reason: Usually low pressure is also favourable for chemisorption.

What is difference between physisorption and chemisorption ?

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