This quiz focuses on Surface Chemistry, exploring processes at phase interfaces, adsorption principles, and characteristics of physisorption.
∆H > 0
∆H = T∆S
∆H > T∆S
∆H < T∆S
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Option 1
Option 2
Option 3
Option 4
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Increase in temperature
Decrease in temperature.
Decrease in surface area of adsorbent.
Decrease in strength of van der Waals forces.
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∆H > 0
∆G < 0
∆S < 0
∆H < 0
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Involved van der Waals forces are universal.
Gases involved behave like ideal gases.
Enthalpy of adsorption is low.
It is a reversible process
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Liquid-liquid
Solid-liquid
Liquid-gas
Gas-gas
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Absorption
Adsorption
Both absorption and adsorption
Desorption
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Increase in amount of adsorbate in solution.
Decrease in surface area of adsorbent.
Increase in temperature of solution
Decrease in amount of adsorbate in solution.
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High pressure
Negative ∆H
Higher critical temperature of adsorbate
High temperature
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Decrease in temperature
Increase in temperature
Increase in surface area of adsorbent
Decrease in surface area of adsorbent
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Water on silica gel
Water on calcium chloride
Hydrogen on finely divided nickel
Oxygen on metal surface
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(b), (c)
(b), (c), (d)
(a), (b), (c)
(d)
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Molecular colloid
Associated colloid
Macromolecular colloid
Lyophilic colloid
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Aqueous solution of soap below critical micelle concentration.
Aqueous solution of soap above critical micelle concentration.
Aqueous solution of sodium chloride.
Aqueous solution of sugar.
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By addition of oppositely charged sol.
By addition of an electrolyte.
By addition of lyophilic sol.
By boiling.
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Coagulation
Electrolysis
Diffusion
Peptisation
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Na2S
Na3 PO4
Na2 SO4
NaCl
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Solid sol
Gel
Emulsion
Sol
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A → b → c → d → e
A → c → b → d → e
A → c → b → e → d
A → b → c → e → d
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Emulsification
Colloid formation
Coagulation
Peptisation
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Exhibit enormous surface area.
Remain suspended in the dispersion medium.
Form lyophilic colloids.
Are comparatively less in number
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