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Surface Chemistry Test - 8

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Surface Chemistry Test - 8
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  • Question 1
    1 / -0.25

     

    Which one of the following is not applicable to chemisorption ?

     

    Solution

     

     

    Chemisorption is irreversible in nature because in chemisorption there are strong covalent bond are formed which do not brake easily to separate the reactants because of this it has high heat of adsorption, takes place at high temperatures and forms monolayers.

     

     

  • Question 2
    1 / -0.25

     

    In the colloidal state the particle size ranges

     

    Solution

     

     

    Colloidal range of particle is 1nm-1000 nm

     

     

  • Question 3
    1 / -0.25

     

    All colloids

     

    Solution

     

     

    colloids are heterogeneous in nature &hence consist of two phase.

     

     

  • Question 4
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    Colloids can be purified by

     

    Solution

     

     

    Refer theory

     

     

  • Question 5
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    Milk is an example of

     

    Solution

     

     

    Milk is emulsion (butter fat dispersed in water).

     

     

  • Question 6
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    Colloidal particles in a sol. can be coagulated by

     

    Solution

     

     

    The correct answer is option  D

    Stability of the lyophobic sols is due to presence of charge on colloidal particles. If charge is removed, particles come together and settle down. Spontaneous destabilization of solution is ageing and destabilization of solution by artificial means is called coagulation.
    Methods of coagulation are as follows:
    1. Boiling
    2. Dialysis
    3. Addition of electrolytes
    4. Mixing two oppositely charged sols
    5. Electrophoresis

     

     

  • Question 7
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    Fog is a colloidal system of

     

    Solution

     

     

    Fog (liquid + gas) dispersed phase Dispersion medium.

     

     

  • Question 8
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    Given below are a few electrolytes, indicates which one among them will bring about the coagulation of a gold sol. quickest and in the least of concentration ?

     

    Solution

     

     

    As per Hardy shulze rule coagulation power a +ve charge which is maximum in Al3+ .

     

     

  • Question 9
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    When a colloidal solution is observed under ultramicroscope, we can see

     

    Solution

     

     

    Ultra –microscope is based on tyndall effect which is based on scattering of light.

     

     

  • Question 10
    1 / -0.25

     

    Colloidal solution are classified on the basis of

     

    Solution

     

     

    Molecular size for colloidal range in 1nm –1000 nm.

     

     

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