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SURFACE CHEMISTRY - 02
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Q1. Choose the incorrect statement in respect of physisorption?
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Enthalpy of adsorption is in the range 80-240 kJ mol–1
It is not specific in nature
It is reversible in nature
It arises because of van der Waal’s force
Q2. The term ‘sorption’ stands for ___________.
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Absorption
Adsorption
Desorption
Both absorption and adsorption
Q3. Extent of physisorption of a gas increases with _______.
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Decrease in surface area of adsorbent.
Decrease in temperature.
Increase in temperature.
Decrease in strength of van der Waal’s forces.
Q4. Which of the following is not a favourable condition for physical adsorption ?
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High pressure
Negative Enthalpy
High temperature
Higher critical temperature of adsorbate
Q5. Physical adsorption of a gaseous species may change to chemical adsorption with ________.
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Increase in surface area of adsorbent
Decrease in surface area of adsorbent
Increase in temperature
Decrease in temperature
Q6. In physisorption adsorbent does not show specificity forany particular gas because _________.
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It is a reversible process
Involved van der Waal’s forces are universal.
Gases involved behave like ideal gases.
Enthalpy of adsorption is low.
Q7. Which of the following is an example of absorption ?
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Hydrogen on finely divided nickel.
Water on calcium chloride.
Oxygen on metal surface.
Water on silica gel .
Q8. For adsorption of a gas on a solid, the plot of log x/m vslog P is linear with slope equal to (n being whole number)
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m
1/n
k
log k
Q9. The adsorption of a gas on a solid surface varies withpressure of the gas in which of the following manner
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Independent of the pressure → slow → fast
Slow → fast → independent of the pressure
Fast → slow → independent of the pressure
Independent of the pressure → fast → slow
Q10. In Freundlich adsorption isotherm, the value of 1/n is
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Between 0 and 1 in all cases
1 in case of chemisorption
Between 2 and 4 in all cases
1 in case of physical adsorption
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