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Standard XII
Chemistry
Addition Reaction
48. How physi...
Question
48. How physisorption become chemisorption at high temperature?
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Q.
How does physisorption change to chemisorption at high temperatures?
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.
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.
Assertion :
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.
Write the differences between physisorption and chemisorption with respect to the following:
(i) specificity
(ii) temperature dependence
(iii) reversibility
(iv) enthalpy change
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