At constant pressure, the extent of chemisorption of a gas on a solid varies with temperature as follows:

Ait decreases continuously with temperature
Bit increases continuously with temperature
Cit first increases with temperature and then decreases
Dit remains independent of temperature

Answer: C

Chemisorption needs activation energy, so the rate and extent rise at moderate temperatures. Being exothermic, the equilibrium extent falls at higher temperature, so there is a maximum.

Practice Surface Chemistry More on Adsorption: physisorption vs chemisorption, Freundlich and Langmuir isotherms

Previous questionNext question

More questions on Adsorption: physisorption vs chemisorption, Freundlich and Langmuir isotherms

For a Langmuir adsorption, the pressure needed to reach 90% coverage is how many times the pressure needed to reach 50% coverage at the same... JEE Main level
Assertion (A): Physisorption of a gas on a solid decreases as temperature is raised at constant pressure. Reason (R): Adsorption is an exoth... JEE Main level
A log-log plot for adsorption of a gas on a solid is linear with slope 0.50 and intercept 0.602 on the log(x/m) axis (take log 4=0.602). The... JEE Main level
Which of the following is an example of chemisorption? JEE Main level
For adsorption of a gas on charcoal, x/m=k p^1/n with k=2.4 mg g^-1 atm^-1/n and 1/n=0.40. Calculate x/m in mg g^-1 at p=3.0 atm. Use 3^0.4=... JEE Main level
In a Freundlich study, x/m=1.5 g/g at p=0.20 atm and x/m=4.5 g/g at p=1.8 atm. The data fit x/m=kp^1/n with n=2 exactly. Calculate k (in g g... JEE Main level