Chemistry 12 Chapter 5 Exemplar Solutions Surface Chemistry Part 1
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I. Multiple Choice Questions (Type-I)
Question 1:
Which of the following process does not occur at the interface of phases?
(i) Crystallisation
(ii) Heterogeneous catalysis
(iii) Homogeneous catalysis
(iv) Corrosion
Answer: (iii)
Question 2:
At the equilibrium position in the process of adsorption ___________.
(i)
(ii)
(iii)
(iv)
Answer: (ii)
Question 3:
Which of the following interface cannot be obtained?
(i) Liquid-liquid
(ii) Solid-liquid
(iii) Liquid-gas
(iv) Gas-gas
Answer: (iv)
Question 4:
The term ‘sorption’ stands for ____________.
(i) Absorption
(ii) Adsorption
(iii) Both absorption and adsorption
(iv) Desorption
Answer: (iii)
Question 5:
Extent of physisorption of a gas increases with ___________.
(i) Increase in temperature.
(ii) Decrease in temperature.
(iii) Decrease in surface area of adsorbent.
(iv) Decrease in strength of van der Waals forces.
Answer: (ii)
Question 6:
Extent of adsorption of adsorbate from solution phase increases with ________.
(i) Increase in amount of adsorbate in solution.
(ii) Decrease in surface area of adsorbent.
(iii) Increase in temperature of solution.
(iv) Decrease in amount of adsorbate in solution.
Answer: (i)
Question 7:
Which one of the following is not applicable to the phenomenon of adsorption?
(i)
(ii)
(iii)
(iv)
Answer: (i)
Question 8:
Which of the following is not a favourable condition for physical adsorption?
(i) High pressure
(ii) Negative
(iii) Higher critical temperature of adsorbate
(iv) High temperature
Answer: (iv)
Question 9:
Physical adsorption of a gaseous species may change to chemical adsorption with ______________.
(i) Decrease in temperature
(ii) Increase in temperature
(iii) Increase in surface area of adsorbent
(iv) Decrease in surface area of adsorbent
Answer: (ii)
Question 10:
In physisorption adsorbent does not show specificity for any particular gas because ______________.
(i) Involved van der Waals forces are universal.
(ii) Gases involved behave like ideal gases.
(iii) Enthalpy of adsorption is low.
(iv) It is a reversible process.
Answer: (i)