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Surface Chemistry Test - 13

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Surface Chemistry Test - 13
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Soap lather is an example of :
    Solution
    Soap lather is an example of foam. Dispersion medium is liquid and dispersed phase is gas.
  • Question 2
    1 / -0
    Which of the following is a property of physisorption?
    Solution
    If the accumulation of gas on the surface of a solid occurs on account of weak van der Waals’ forces, the adsorption is termed as physical adsorption or physisorption.
    Various properties of Physisorption are-
    • Lack of specificity: A given surface of an adsorbent does not show any preference for a particular gas as the van der Waals’ forces are universal.
    • Nature of adsorbate: The amount of gas adsorbed by a solid depends on the nature of gas.
    • Reversible nature: Physical adsorption of a gas by a solid is generally reversible.
    • The surface area of adsorbent: The extent of adsorption increases with the increase of the surface area of the adsorbent
    • Enthalpy of adsorption: Physical adsorption is an exothermic process but its enthalpy of adsorption is quite low the reason being the attraction between gas molecules and the solid surface is only due to weak van der Waals’ forces.
        • Question 3
          1 / -0
          Which one of the following can form micelle?
          Solution
          Micelles are lipid molecules that arrange themselves in a spherical form in aqueous solutions. They contain both hydrophilic regions (polar head groups) as well as hydrophobic regions (the long hydrophobic chain). Hence it is represented as, $$Na^+COO----R----^-OOCNa^+$$
        • Question 4
          1 / -0
          An example of colloidal sol in which the affinity of the sol particles for the medium is due to hydrogen bonding is :
          Solution
          Protein water is an example of colloidal sol in which the affinity of the sol particles for the medium is due to hydrogen bonding.
        • Question 5
          1 / -0
          From the following which is not an emulsifer?
          Solution
          The substances that stabilise emulsions are called emulsifiers. Agar, gum and soap all are emulsifier while milk is an emulsion, not an emulsifier.
        • Question 6
          1 / -0
          In an experiment, $$200ml$$. of $$0.5$$ oxalic acid is shaken with $$10g$$ of activated charcoal and fiftered. The concentration of the filtrate is reduced to $$0.4 M$$. The amount of adsorption $$(x/m)$$ is?
        • Question 7
          1 / -0
          $$Fe(OH)_3$$ sol is :
          Solution
          When a large number of atoms of a substance combine in a dispersion medium having size in the colloidal, the filmed solutions are called multimolecular colloids.
          Sulphur solution consists of particles containing about a thousands of $$S8$$ molecules. $$Fe(OH)_3$$ is a multimolecular colloids.
        • Question 8
          1 / -0
          The process of adsorption of hydrogen over palladium surface is called:
          Solution
          Adsorption of gas on the surface of solid is also known as occlusion. hence $$B$$ is correct.
        • Question 9
          1 / -0
          Assertion:
          A catalyst enhances the rate of a reaction.

          Reason: 
          The energy of activation of the reaction is lowered in the presence of a catalyst.
          Solution
          The addition of catalyst lowers the activation barrier. So, that's why it enhances the rate of reaction, 

          Hence, the correct answer option is [A].
        • Question 10
          1 / -0
          A catalyst:
          (i) increases the average kinetic energy of reacting molecules
          (ii) decrease the activation energy
          (iii) alters the reaction mechanism
          (iv) increases the frequency of collisions of reacting species.
          The true statements are:
          Solution
          A catalyst is a substance which when added to a reaction, finds an alternative route (hence, altering the reaction mechanism) with lower activation energy as shown in the diagram. Remember that with a catalyst, the average kinetic energy of the molecules remains the same but the required energy decreases. So, (i) and (iv) are wrong.

          Hence, D is the correct answer.

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