320656
Which characteristic is not associated with chemical adsorption?
1 Is irreversible
2 Forms monolayer
3 Not very specific
4 Heat of adsorption \(>50 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Explanation:
Chemisorption is highly specific and it will only occur if there is some possibility of chemical bonding. \(e.g.\) Oxygen is adsorbed on metals by virtue of oxide formation and hydrogen is adsorbed by transition metals with unpaired d-orbital leading to hydride formation.
CHXII05:SURFACE CHEMISTRY
320657
Which of the following is correct for the decrease in the physical adsorption with increase of temperature?
1 Adsorption process is exothermic, and according to Lechatelier principle, the physical adsorption decreases with increase in temperature.
2 Physical adsorption is endothermic
3 Physical adsorption occurs at high temperature
4 All of the above
Explanation:
Conceptual Questions
CHXII05:SURFACE CHEMISTRY
320658
Which of the following is not a favourable condition for physical adsorption?
1 High pressure
2 Low temperature
3 High temperature
4 Higher critical temperature of adsorbate
Explanation:
Usually the physical adsorption process is exothermic in nature, so extent of adsorption decreases with increase in temperature.
KCET - 2017
CHXII05:SURFACE CHEMISTRY
320659
How many of the following features CORRECT regarding physisorption? i. Highly specific in nature. ii. Heat of adsorption is low. iii. Favoured at low temperature. iv. Reversible in nature. v. Forms monomolecular layer of adsorbed particles.
1 5
2 1
3 3
4 2
Explanation:
Points (ii), (iii) and (iv) are correct regarding physisorption.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
CHXII05:SURFACE CHEMISTRY
320656
Which characteristic is not associated with chemical adsorption?
1 Is irreversible
2 Forms monolayer
3 Not very specific
4 Heat of adsorption \(>50 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Explanation:
Chemisorption is highly specific and it will only occur if there is some possibility of chemical bonding. \(e.g.\) Oxygen is adsorbed on metals by virtue of oxide formation and hydrogen is adsorbed by transition metals with unpaired d-orbital leading to hydride formation.
CHXII05:SURFACE CHEMISTRY
320657
Which of the following is correct for the decrease in the physical adsorption with increase of temperature?
1 Adsorption process is exothermic, and according to Lechatelier principle, the physical adsorption decreases with increase in temperature.
2 Physical adsorption is endothermic
3 Physical adsorption occurs at high temperature
4 All of the above
Explanation:
Conceptual Questions
CHXII05:SURFACE CHEMISTRY
320658
Which of the following is not a favourable condition for physical adsorption?
1 High pressure
2 Low temperature
3 High temperature
4 Higher critical temperature of adsorbate
Explanation:
Usually the physical adsorption process is exothermic in nature, so extent of adsorption decreases with increase in temperature.
KCET - 2017
CHXII05:SURFACE CHEMISTRY
320659
How many of the following features CORRECT regarding physisorption? i. Highly specific in nature. ii. Heat of adsorption is low. iii. Favoured at low temperature. iv. Reversible in nature. v. Forms monomolecular layer of adsorbed particles.
1 5
2 1
3 3
4 2
Explanation:
Points (ii), (iii) and (iv) are correct regarding physisorption.
320656
Which characteristic is not associated with chemical adsorption?
1 Is irreversible
2 Forms monolayer
3 Not very specific
4 Heat of adsorption \(>50 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Explanation:
Chemisorption is highly specific and it will only occur if there is some possibility of chemical bonding. \(e.g.\) Oxygen is adsorbed on metals by virtue of oxide formation and hydrogen is adsorbed by transition metals with unpaired d-orbital leading to hydride formation.
CHXII05:SURFACE CHEMISTRY
320657
Which of the following is correct for the decrease in the physical adsorption with increase of temperature?
1 Adsorption process is exothermic, and according to Lechatelier principle, the physical adsorption decreases with increase in temperature.
2 Physical adsorption is endothermic
3 Physical adsorption occurs at high temperature
4 All of the above
Explanation:
Conceptual Questions
CHXII05:SURFACE CHEMISTRY
320658
Which of the following is not a favourable condition for physical adsorption?
1 High pressure
2 Low temperature
3 High temperature
4 Higher critical temperature of adsorbate
Explanation:
Usually the physical adsorption process is exothermic in nature, so extent of adsorption decreases with increase in temperature.
KCET - 2017
CHXII05:SURFACE CHEMISTRY
320659
How many of the following features CORRECT regarding physisorption? i. Highly specific in nature. ii. Heat of adsorption is low. iii. Favoured at low temperature. iv. Reversible in nature. v. Forms monomolecular layer of adsorbed particles.
1 5
2 1
3 3
4 2
Explanation:
Points (ii), (iii) and (iv) are correct regarding physisorption.
320656
Which characteristic is not associated with chemical adsorption?
1 Is irreversible
2 Forms monolayer
3 Not very specific
4 Heat of adsorption \(>50 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
Explanation:
Chemisorption is highly specific and it will only occur if there is some possibility of chemical bonding. \(e.g.\) Oxygen is adsorbed on metals by virtue of oxide formation and hydrogen is adsorbed by transition metals with unpaired d-orbital leading to hydride formation.
CHXII05:SURFACE CHEMISTRY
320657
Which of the following is correct for the decrease in the physical adsorption with increase of temperature?
1 Adsorption process is exothermic, and according to Lechatelier principle, the physical adsorption decreases with increase in temperature.
2 Physical adsorption is endothermic
3 Physical adsorption occurs at high temperature
4 All of the above
Explanation:
Conceptual Questions
CHXII05:SURFACE CHEMISTRY
320658
Which of the following is not a favourable condition for physical adsorption?
1 High pressure
2 Low temperature
3 High temperature
4 Higher critical temperature of adsorbate
Explanation:
Usually the physical adsorption process is exothermic in nature, so extent of adsorption decreases with increase in temperature.
KCET - 2017
CHXII05:SURFACE CHEMISTRY
320659
How many of the following features CORRECT regarding physisorption? i. Highly specific in nature. ii. Heat of adsorption is low. iii. Favoured at low temperature. iv. Reversible in nature. v. Forms monomolecular layer of adsorbed particles.
1 5
2 1
3 3
4 2
Explanation:
Points (ii), (iii) and (iv) are correct regarding physisorption.