20790
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
Explanation:
Characteristics of Physisorption are- It is not Specific in nature. It is a Reversible process. It is not specific in nature. It depends on the nature of the gas. More easily liquefiable gases are adsorbed readily. Enthalpy of adsorption is low. Low temperature is favorable for adsorption. There is no necessity of activation energy. It depends on the surface area. Hence, porous surfaces are good adsorbents.
SURFACE CHEMISTRY
20791
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid
1 Decreases
2 Increases
3 Remains unaffected
4 Decreases first then increases
Explanation:
When the temperature is lowered, there will be a decrease in kinetic energy of the molecules of a gas. Hence, adsorption increases. When the pressure increases, adsorption of a gas also increases.
SURFACE CHEMISTRY
20792
In physical adsorption, the gas molecules are held on solid surface by
1 Chemical forces
2 Electrostatic forces
3 Gravitational forces
4 Vander Waal's forces
Explanation:
In physisorption, the enthalpy of adsorption is very low as the accumulation of substances on the surface is due to van der Waals forces which are weak in nature.
SURFACE CHEMISTRY
20793
Adsorption is multilayer in the case of
1 Physical adsorption
2 Chemisorption
3 Both
4 None of both
Explanation:
Adsorption is multilayer in case of physical adsorption. However, in the case of chemisorption, the absorption is unilayer as it involves the formation of a chemical bond between adsorbate and adsorbent molecules.
20790
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
Explanation:
Characteristics of Physisorption are- It is not Specific in nature. It is a Reversible process. It is not specific in nature. It depends on the nature of the gas. More easily liquefiable gases are adsorbed readily. Enthalpy of adsorption is low. Low temperature is favorable for adsorption. There is no necessity of activation energy. It depends on the surface area. Hence, porous surfaces are good adsorbents.
SURFACE CHEMISTRY
20791
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid
1 Decreases
2 Increases
3 Remains unaffected
4 Decreases first then increases
Explanation:
When the temperature is lowered, there will be a decrease in kinetic energy of the molecules of a gas. Hence, adsorption increases. When the pressure increases, adsorption of a gas also increases.
SURFACE CHEMISTRY
20792
In physical adsorption, the gas molecules are held on solid surface by
1 Chemical forces
2 Electrostatic forces
3 Gravitational forces
4 Vander Waal's forces
Explanation:
In physisorption, the enthalpy of adsorption is very low as the accumulation of substances on the surface is due to van der Waals forces which are weak in nature.
SURFACE CHEMISTRY
20793
Adsorption is multilayer in the case of
1 Physical adsorption
2 Chemisorption
3 Both
4 None of both
Explanation:
Adsorption is multilayer in case of physical adsorption. However, in the case of chemisorption, the absorption is unilayer as it involves the formation of a chemical bond between adsorbate and adsorbent molecules.
20790
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
Explanation:
Characteristics of Physisorption are- It is not Specific in nature. It is a Reversible process. It is not specific in nature. It depends on the nature of the gas. More easily liquefiable gases are adsorbed readily. Enthalpy of adsorption is low. Low temperature is favorable for adsorption. There is no necessity of activation energy. It depends on the surface area. Hence, porous surfaces are good adsorbents.
SURFACE CHEMISTRY
20791
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid
1 Decreases
2 Increases
3 Remains unaffected
4 Decreases first then increases
Explanation:
When the temperature is lowered, there will be a decrease in kinetic energy of the molecules of a gas. Hence, adsorption increases. When the pressure increases, adsorption of a gas also increases.
SURFACE CHEMISTRY
20792
In physical adsorption, the gas molecules are held on solid surface by
1 Chemical forces
2 Electrostatic forces
3 Gravitational forces
4 Vander Waal's forces
Explanation:
In physisorption, the enthalpy of adsorption is very low as the accumulation of substances on the surface is due to van der Waals forces which are weak in nature.
SURFACE CHEMISTRY
20793
Adsorption is multilayer in the case of
1 Physical adsorption
2 Chemisorption
3 Both
4 None of both
Explanation:
Adsorption is multilayer in case of physical adsorption. However, in the case of chemisorption, the absorption is unilayer as it involves the formation of a chemical bond between adsorbate and adsorbent molecules.
20790
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
Explanation:
Characteristics of Physisorption are- It is not Specific in nature. It is a Reversible process. It is not specific in nature. It depends on the nature of the gas. More easily liquefiable gases are adsorbed readily. Enthalpy of adsorption is low. Low temperature is favorable for adsorption. There is no necessity of activation energy. It depends on the surface area. Hence, porous surfaces are good adsorbents.
SURFACE CHEMISTRY
20791
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid
1 Decreases
2 Increases
3 Remains unaffected
4 Decreases first then increases
Explanation:
When the temperature is lowered, there will be a decrease in kinetic energy of the molecules of a gas. Hence, adsorption increases. When the pressure increases, adsorption of a gas also increases.
SURFACE CHEMISTRY
20792
In physical adsorption, the gas molecules are held on solid surface by
1 Chemical forces
2 Electrostatic forces
3 Gravitational forces
4 Vander Waal's forces
Explanation:
In physisorption, the enthalpy of adsorption is very low as the accumulation of substances on the surface is due to van der Waals forces which are weak in nature.
SURFACE CHEMISTRY
20793
Adsorption is multilayer in the case of
1 Physical adsorption
2 Chemisorption
3 Both
4 None of both
Explanation:
Adsorption is multilayer in case of physical adsorption. However, in the case of chemisorption, the absorption is unilayer as it involves the formation of a chemical bond between adsorbate and adsorbent molecules.
