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Surface Chemistry Test - 7

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Surface Chemistry Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0.25

     

    The minimum concentration of an electrolyte required to cause coagulation of a sol. is called

     

    Solution

     

     

    Refer theory

     

     

  • Question 2
    1 / -0.25

     

    The electrical charge on a colloidal particle is indicated by

     

    Solution

     

     

    Due to charge on colloidal particle they move under the influence of electric field.

     

     

  • Question 3
    1 / -0.25

     

    Smoke precipitator works on the principle of

     

    Solution

     

     

    Neutralization of charge on colloid as per hardy shulze rule.

     

     

  • Question 4
    1 / -0.25

     

    Which one of following statement is not correct in respect of lyophilic sols ?

     

    Solution

     

     

    Lyophilic colloids do not move in presence of electric field due to uncharged nature.

     

     

  • Question 5
    1 / -0.25

     

    As2 S3  sol is

     

    Solution

     

     

    As2 S3 colloid can be represented as As2 S3 s2 –
    so it is negatively charged.

     

     

  • Question 6
    1 / -0.25

     

    Crystalloids differ from colloids mainly in respect of

     

    Solution

     

     

    Crystalloid &colloids differes in particle size &due to smaller size of crystalloid.

     

     

  • Question 7
    1 / -0.25

     

    At the critical micelle concentration (CMC) the surfacent molecules

     

    Solution

     

     

    Micelle is a associated form of colloid

     

     

  • Question 8
    1 / -0.25

     

    Alums purify muddy water by

     

    Solution

     

     

    Alums due to the charged nature of colloidal particle &hence coagular impurities in muddy water as per shulze rule.

     

     

  • Question 9
    1 / -0.25

     

    Solute dispersed in ethanol is called

     

    Solution

     

     

    Ethanol is alcohol to the colloidal system is called alcosols.

     

     

  • Question 10
    1 / -0.25

     

    Which one of the following is lyophilic colloid ?

     

    Solution

     

     

    Colloidal sols formed  by mixing substances in a suitable dispersion medium are called lyophilic sols. These are quite stable. They are also known as reversible sols because the dispersion medium can be separated from the colloid by means of physical methods like evaporation. For e.g. gum, gelatin, starch, rubber etc.

     

     

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