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Surface Chemistry Test - 11
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Surface Chemistry Test - 11
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  • Question 1/10
    1 / -0.25

    Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloidal sols are divided in how many categories?

    Solutions

    Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloidal sols are divided into two categories, namely, lyophilic (solvent attracting) and lyophobic (solvent repelling).

  • Question 2/10
    1 / -0.25

    When do particles aggregate to form micelles?

    Solutions

    The correct answer is Option D.
    In high concentration, particles aggregate to form micelles; it happens above Tk called kraft ’s temperature and critical micelle concentration (CMC). If the concentration is low and it forms a true solution.

  • Question 3/10
    1 / -0.25

    Foam rubber is an example of which type of colloid?

    Solutions

    Foam is a dispersion of a gas in a liquid (liquid foams) or in a solid (solid foams). Foam rubber is gas dispersed in rubber.

  • Question 4/10
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    An example of colloid in which both phase and medium are solid is?

    Solutions

    The correct answer is Option D.

     

  • Question 5/10
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    The name aquadag is given to the colloidal sol of:

    Solutions

    The correct answer is Option C.

    Aquadag is the name of a water-based colloidal graphite coating which is a colloidal solution of graphite in water.

  • Question 6/10
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    Which method is used for preparation of metal sols?

    Solutions

    The correct answer is Option A
    The method of preparation of colloidal solutions of metals such as platinum, gold or silver is known as Bredig 's arc method or Electrical disintegration.

     It consists of both dispersion and condensation. It can not be used to prepare a colloidal solution of copper and sodium.

  • Question 7/10
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    The formation of micelles takes places above a particular temperature, called as:

    Solutions

    The correct answer is Option B. 

    Associated colloids are substances which at low concentrations behave as normal strong electrolytes, but at higher concentrations exhibit colloidal behaviour due to the formation of aggregates. 
    The aggregated particles thus formed are called micelles. 
    The formation of micelles takes place only above a particular temperature called Kraft temperature (Tk) and above a particular concentration called critical micelle concentration (CMC).

  • Question 8/10
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    Rotation at high speed makes the colloid settle down and the impurities remain in solution. What is this process called?

    Solutions

    The correct answer is Option A.
    Ultracentrifugation involves the separation of colloidal particles from the impurities by centrifugal force.
    The impure sol is taken in a tube and the tube is placed in an ultracentrifuge. The tube is rotated at high speeds.
    On account of this, the colloidal particles settle down at the bottom of the tube and the impurities remain in the solution.
    This solution is termed as centrifugate. The settled colloidal particles are removed from the tube and are mixed with an appropriate dispersing medium. Thus, the pure sol is obtained.

  • Question 9/10
    1 / -0.25

    A dispersion of AgCl in water is:

    Solutions

    The correct answer is Option A.
    AgCl being a covalent molecule is insoluble in water and hence hydrophobic.
     

  • Question 10/10
    1 / -0.25

    Blood is purified by:

    Solutions

    The correct answer is Option A.

    Blood is a colloidal which contains crystalloids as impurity hence can be separated by Dialysis.

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