20785
Which among the following statement is false
1 The adsorption may be monolayered or multilayered
2 Particle size of adsorbent will not affect the amount of adsorption
3 Increase of pressure increases amount of adsorption
4 Increase of temperature may decrease the amount of adsorption
Explanation:
Adsorption is reversible in nature and is dependent on pressure as well as temperature. An increase in pressure decreases the volume of gas and thus increases the adsorption of gas molecules. Conversely, a decrease in pressure will cause the removal of gas molecules from the solid surface. Since the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increasing temperature (LeChatelier's principle). Porous substances are better adsorbents as an increased surface area promotes adsorption. Particle size of the adsorbent affects the amount of adsorption. Smaller is the particle size of the adsorbent, higher is the amount of adsorption and vice versa. Smaller particle size of the adsorbent corresponds to larger surface area.
SURFACE CHEMISTRY
20786
Wood charcoal is used to decolourise sugar because it
1 Adsorbs coloured material
2 Absorbs decolorised material
3 Reduces coloured material
4 None of these
Explanation:
Wood charcoal is used to decolorize sugar because it has a highly porous structure, providing a large surface area for adsorption. Therefore it adsorbs colored material from sugar.
SURFACE CHEMISTRY
20787
If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
1 Physical adsorption
2 Chemical adsorption
3 Heat of adsorption
4 Enthalpy of adsorption
Explanation:
The adsorption in which molecules of adsorbate are held on the surface of adsorbent by Van der Waals forces or weak physical forces is called as physical adsorption or Van der Waals adsorption or physisorption.
SURFACE CHEMISTRY
20788
When the temperature is raised, the viscosity of liquid decreases, this is because
1 Decreased volume of the solution
2 Increase in temperature increases the average kinetic energy of molecules, which overcome the attractive force between them
3 Decreased covalent and hydrogen bond forces
4 Increased attraction between molecules
Explanation:
(b)When the temperature is raised, the viscosity of liquid decreases, this is because increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them.
20785
Which among the following statement is false
1 The adsorption may be monolayered or multilayered
2 Particle size of adsorbent will not affect the amount of adsorption
3 Increase of pressure increases amount of adsorption
4 Increase of temperature may decrease the amount of adsorption
Explanation:
Adsorption is reversible in nature and is dependent on pressure as well as temperature. An increase in pressure decreases the volume of gas and thus increases the adsorption of gas molecules. Conversely, a decrease in pressure will cause the removal of gas molecules from the solid surface. Since the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increasing temperature (LeChatelier's principle). Porous substances are better adsorbents as an increased surface area promotes adsorption. Particle size of the adsorbent affects the amount of adsorption. Smaller is the particle size of the adsorbent, higher is the amount of adsorption and vice versa. Smaller particle size of the adsorbent corresponds to larger surface area.
SURFACE CHEMISTRY
20786
Wood charcoal is used to decolourise sugar because it
1 Adsorbs coloured material
2 Absorbs decolorised material
3 Reduces coloured material
4 None of these
Explanation:
Wood charcoal is used to decolorize sugar because it has a highly porous structure, providing a large surface area for adsorption. Therefore it adsorbs colored material from sugar.
SURFACE CHEMISTRY
20787
If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
1 Physical adsorption
2 Chemical adsorption
3 Heat of adsorption
4 Enthalpy of adsorption
Explanation:
The adsorption in which molecules of adsorbate are held on the surface of adsorbent by Van der Waals forces or weak physical forces is called as physical adsorption or Van der Waals adsorption or physisorption.
SURFACE CHEMISTRY
20788
When the temperature is raised, the viscosity of liquid decreases, this is because
1 Decreased volume of the solution
2 Increase in temperature increases the average kinetic energy of molecules, which overcome the attractive force between them
3 Decreased covalent and hydrogen bond forces
4 Increased attraction between molecules
Explanation:
(b)When the temperature is raised, the viscosity of liquid decreases, this is because increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them.
20785
Which among the following statement is false
1 The adsorption may be monolayered or multilayered
2 Particle size of adsorbent will not affect the amount of adsorption
3 Increase of pressure increases amount of adsorption
4 Increase of temperature may decrease the amount of adsorption
Explanation:
Adsorption is reversible in nature and is dependent on pressure as well as temperature. An increase in pressure decreases the volume of gas and thus increases the adsorption of gas molecules. Conversely, a decrease in pressure will cause the removal of gas molecules from the solid surface. Since the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increasing temperature (LeChatelier's principle). Porous substances are better adsorbents as an increased surface area promotes adsorption. Particle size of the adsorbent affects the amount of adsorption. Smaller is the particle size of the adsorbent, higher is the amount of adsorption and vice versa. Smaller particle size of the adsorbent corresponds to larger surface area.
SURFACE CHEMISTRY
20786
Wood charcoal is used to decolourise sugar because it
1 Adsorbs coloured material
2 Absorbs decolorised material
3 Reduces coloured material
4 None of these
Explanation:
Wood charcoal is used to decolorize sugar because it has a highly porous structure, providing a large surface area for adsorption. Therefore it adsorbs colored material from sugar.
SURFACE CHEMISTRY
20787
If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
1 Physical adsorption
2 Chemical adsorption
3 Heat of adsorption
4 Enthalpy of adsorption
Explanation:
The adsorption in which molecules of adsorbate are held on the surface of adsorbent by Van der Waals forces or weak physical forces is called as physical adsorption or Van der Waals adsorption or physisorption.
SURFACE CHEMISTRY
20788
When the temperature is raised, the viscosity of liquid decreases, this is because
1 Decreased volume of the solution
2 Increase in temperature increases the average kinetic energy of molecules, which overcome the attractive force between them
3 Decreased covalent and hydrogen bond forces
4 Increased attraction between molecules
Explanation:
(b)When the temperature is raised, the viscosity of liquid decreases, this is because increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them.
20785
Which among the following statement is false
1 The adsorption may be monolayered or multilayered
2 Particle size of adsorbent will not affect the amount of adsorption
3 Increase of pressure increases amount of adsorption
4 Increase of temperature may decrease the amount of adsorption
Explanation:
Adsorption is reversible in nature and is dependent on pressure as well as temperature. An increase in pressure decreases the volume of gas and thus increases the adsorption of gas molecules. Conversely, a decrease in pressure will cause the removal of gas molecules from the solid surface. Since the adsorption process is exothermic, the physical adsorption occurs readily at low temperature and decreases with increasing temperature (LeChatelier's principle). Porous substances are better adsorbents as an increased surface area promotes adsorption. Particle size of the adsorbent affects the amount of adsorption. Smaller is the particle size of the adsorbent, higher is the amount of adsorption and vice versa. Smaller particle size of the adsorbent corresponds to larger surface area.
SURFACE CHEMISTRY
20786
Wood charcoal is used to decolourise sugar because it
1 Adsorbs coloured material
2 Absorbs decolorised material
3 Reduces coloured material
4 None of these
Explanation:
Wood charcoal is used to decolorize sugar because it has a highly porous structure, providing a large surface area for adsorption. Therefore it adsorbs colored material from sugar.
SURFACE CHEMISTRY
20787
If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
1 Physical adsorption
2 Chemical adsorption
3 Heat of adsorption
4 Enthalpy of adsorption
Explanation:
The adsorption in which molecules of adsorbate are held on the surface of adsorbent by Van der Waals forces or weak physical forces is called as physical adsorption or Van der Waals adsorption or physisorption.
SURFACE CHEMISTRY
20788
When the temperature is raised, the viscosity of liquid decreases, this is because
1 Decreased volume of the solution
2 Increase in temperature increases the average kinetic energy of molecules, which overcome the attractive force between them
3 Decreased covalent and hydrogen bond forces
4 Increased attraction between molecules
Explanation:
(b)When the temperature is raised, the viscosity of liquid decreases, this is because increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them.
