Physisorption

Q.

Enthalpy of adsorption for physisorption is low and positive.

1. True

2. False

Q. 3.6 g of oxygen is adsorbed on 1.2 g of a metal powder. What volume of oxygen is adsorbed per gram of the adsorbent at 1 atm and 300 K?

1. $0.19L{g}^{-1}$
2. $1L{g}^{-1}$
3. $2.31L{g}^{-1}$
4. $3.14L{g}^{-1}$

Q. 3.6 g of oxygen is adsorbed on 1.2 g of a metal powder. What volume of oxygen is adsorbed per gram of the adsorbent at 1 atm and 300 K?

1. $0.19L{g}^{-1}$
2. $1L{g}^{-1}$
3. $2.31L{g}^{-1}$
4. $3.14L{g}^{-1}$

Q. Which of the following statements is incorrect regarding a physisorption process?

1. There are van der Waal's interactions between the adsorbate and the adsorbent
2. The process predominates at low temperature
3. The process cannot proceed beyond a monolayer
4. The process is reversible

Q.

Point out the wrong statement :

Physical adsorption is characterised by

1. Attraction due to weak Vander Waal's forces

2. Irreversible nature of adsorption

3. Multimolecular adsorption layers

4. Decrease in adsorption with increase in temperature

Q.

Physical adsorption

1. Involves the weak attractive interaction between the adsorbent and adsorbate

2. Involves the chemical interactions between the adsorbent and adsorbate

3. Is irreversible in nature

4. Increases with increase of temperature

Q.

Which one of the following is an incorrect statement for physisorption

1. It is a reversible process

2. It requires less heat of adsorption

3. It requires activation energy

4. It takes place at low temperature

Q. Methylene blue, from its aqueous solution, is absorbed on activated charcoal ${25}^{\circ }C$. For this process, the correct statement is

1. the absorption requires activation at ${25}^{\circ }C$
2. the absorption is accompained by a decreases in enthalpy
3. the absorption increases with increase of temperature
4. the absorption is irreversible.

Q. Which of the following statements is incorrect regarding a physisorption process?

1. There are van der Waal's interactions between the adsorbate and the adsorbent
2. The process predominates at low temperature
3. The process cannot proceed beyond a monolayer
4. The process is reversible