Mechanism of Adsorption

Q.

During the adsorption of Krypton on activated charcoal at low temperature, which of the following is true?

1. $\Delta H<0and\Delta S<0$
2. $\Delta H>0and\Delta S<0$
3. $\Delta H>0and\Delta S>0$
4. $\Delta H<0and\Delta S>0$

Q.

Which one of the following statements is wrong about adsorption ?

1. it is a selective and specific process
2. it is a reversible process
3. an increase in the gaseous adsorbate causes increase in adsorption. However, at high pressure, the adsorption becomes constant
4. it is an endothermic process

Q. Which one of the following characteristics is not correct for physical adsorption?

1. Adsorption on solids is reversible
2. Both enthalpy and entropy of adsorption are negative
3. Adsorption is spontaneous
4. Adsorption increases with increase in temperature

Q. Which one of the following characteristics is not correct for physical adsorption?

1. Adsorption increases with increase in temperature
2. Adsorption on solids is reversible
3. Adsorption is spontaneous
4. Both enthalpy and entropy of adsorption are negative

Q. Which of the following is true in respect of adsorption?

1. $△G<0,△S>0,△H<0$
2. $△G<0,△S<0,△H<0$
3. $△G>0,△S>0,△H<0$
4. $△G<0,△S<0,△H>0$