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Surface Chemistry Test - 2

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Surface Chemistry Test - 2
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Weekly Quiz Competition
  • Question 1
    4 / -1

    After the reaction is over between adsorbed reactants, it is important to create space for the other reactant molecules to approach the surface and react. The process responsible for this is known as

    Solution

    Desorption removes products from the surface to create space for other reactants.

  • Question 2
    4 / -1

    Which of the following statements does not show correct difference between adsorption and adsorption?

    Solution

    Gases, liquids or solids can be absorbed on the solids surfaces.

  • Question 3
    4 / -1

    Powdered substances are more effective adsorbents than their crystalline form because

    Solution

    Finely powdered substances have large, porous surface areas, hence act as better adsorbent

  • Question 4
    4 / -1

    The term activation of adsorbent is used when

    Solution

    Activation of an adsorbent means, increasing the adsorbing power of the adsorbent. This can be achieved by, making their surface rough by mechanical rubbing or by chemical action. By doing so, it will increase the specific area of the adsorbent.

  • Question 5
    4 / -1

    Which of the following is less than zero during adsorption?

    Solution

    Adsorption is a spontaneous, exothermic process with decrease in entropy, hence ΔG = -ve, ΔH = -ve and ΔS = -ve.

  • Question 6
    4 / -1

    Which of the following is a property of physisorption?

    Solution

    Physisorption is non-specific in nature.

  • Question 7
    4 / -1

    Which of the following statements is not correct about physisorption?

    Solution

    Physisorption does not require activation roergy since it takes place at low temperature.

  • Question 8
    4 / -1

    The incorrect statement about physical adsorption is

    Solution

    Heat of adsorption of physical adsorption is quite low.

  • Question 9
    4 / -1

    Which is correct in case of vander Waals adsorption?

    Solution

    vander Waals adsorption i.e. physisorption increase at low temperature and high pressure.

  • Question 10
    4 / -1

    Adsorption is accompanied by the evolution of heat. So according to Le-Chatelier principle, the amount of substance adsorbed should

    Solution

    According to Le -Chatelier's principle exothermic reactions are favoured at low temperature.

  • Question 11
    4 / -1

    Which of the following gases is least adsorbed on charcoal?

    Solution

    It has been found that more readily liquefiable gases are adsorbed more than permanent gases.

  • Question 12
    4 / -1

    Which of the following is not characteristic of chemisorpiton?

    Solution

    Chemisorption forms unimolecular or one layer.

  • Question 13
    4 / -1

    Chemisorption involves formation of bond between gaseous molecules or atoms and the solid surface for which high energy is required. Thus it is also referred as

    Solution

    Chemisorption is also referred as activated adsorption since it induces high activation energy.

  • Question 14
    4 / -1

    Which of the following is not correct regarding the adsorption of a gas on the surface of solid?

    Solution

    Adsorption does not keep increasing continuously with increase in pressure.

  • Question 15
    4 / -1

    Which of the plots is adsorption isobar for chemisorption?

    Solution

    The extent of adsorption first increases and then decreases with increase in temperature.

  • Question 16
    4 / -1

    Which of the following statements is not correct for chemisorption and physisorption?

    Solution

    Chemisorption increases and physisorption decreases with rise in temperature.

  • Question 17
    4 / -1

    In the adsorption of a gas on solid, Freundlich isotherm is obeyed. The slope of the plot is zero. Thus, the extent of adsorption is

    Solution

    x/m = kp1/n
    In x/m = In k + (1/n) In P [∵ Slope = (1/n) = 0]
    Thus, x/m = kp° ⇒ x/m = k

  • Question 18
    4 / -1

    In Freundlich adsorption equation x/m = kp1/n, the value of n is

    Solution

    n is always greater than one.

  • Question 19
    4 / -1

    Which of the following graphs would yield a straight line?

    Solution

    Equation of straight line for adsorption is log(x/m) = log K + (1/n) log p. Thus, plot between log(x/m) vs log p gives a straight line.

  • Question 20
    4 / -1

    A graph is plotted between log (x/m) and P according to the equation x/m = kp1/n

    Which of the following statements about this graph is not correct?

    Solution

    This is Freundlich isotherm not Langmuir.

  • Question 21
    4 / -1

    At low pressure, the fraction of the surface covered follows

    Solution

    As (x/m) = kp1/n
    At low pressure x/m ∝ p  (graph is nearly a straight line)
    Thus, the reaction follows first order kinetics.

  • Question 22
    4 / -1

    What is the role of activated charcoal in gas masks used in mines?

    Solution

    The poisonous gases present in coal mines are adsorbed on the activated charcoaL

  • Question 23
    4 / -1

    Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask?

    Solution

    Easily liquefiable gases like CO2, NH3, SO2, etc. are more easily adsorbed than the elemental gases like H2, N2, O2, etc.

  • Question 24
    4 / -1

    Match the column I with column II and mark the appropriate choice.

  • Question 25
    4 / -1

    Which of the following is application of adsorption in chemical analysis?

    Solution

     All are the applications of adsorption.

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