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Surface Chemistry Test - 32

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Surface Chemistry Test - 32
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Peptization denotes:
  • Question 2
    1 / -0
    Sulphur sol contains:
  • Question 3
    1 / -0
    An emulsion is a colloidal solution consisting of:
    Solution
    Emulsion is a colloidal system in which both the dispersed phase and dispersion medium are liquids.
  • Question 4
    1 / -0
    An emulsifier is a substance which:
    Solution
    An emulsion is prepared by subjecting a mixture of the immiscible liquid to a distinct layers upon standing. The oil globules rise to form an upper layer while aqueous medium forms lower layers.To prevent the separation of layers and to get the stable emulsion, a small quantity of emulsifier is added which stabilises the emulsion
  • Question 5
    1 / -0
    Emulsions of polyvinyl acetate are used in:
    Solution
    Polyvinyl acetate is most widely used water resin. This water-based emulsion is used as latex house paints and common household white glues. 

    So the answer is option B.
  • Question 6
    1 / -0
    When a sulphur sol is evaporated, solid sulphur is left. On mixing with water no colloidal sol is formed. The sulphur sol is:
    Solution
    The colloidal system in which the dispersed phase have no affinity for the dispersion medium are called lyophobic (solvent hating) colloids. They are easily precipitated (or coagulated) on the addition of small amounts of the electrolyte, by heating or by shaking. They are less stable and irreversible. When the dispersion medium is water, these are known as hydrophobic colloids and sulphur when mixing with water does not form colloidal sol as it if hydrophobic.
  • Question 7
    1 / -0
    An emulsifier is a substance which:
    Solution
    Emulsification is the process which involves the preparation of emulsion.Generally, an emulsion is prepared by subjecting a mixture of the immiscible liquid to a distinct layers upon standing. To prevent the separation of layers and to get the stable emulsion, a small quantity of the third substance is added. This substance which stabilizes the emulsion is called emulsifier.
  • Question 8
    1 / -0
    Which is not a colloidal solution of gas in liquid?
    Solution
    Mist is an example of liquid droplets dispersed in air (gas) whereas froth, foam and whipped cream are examples of gas dispersed in liquid.
  • Question 9
    1 / -0
    Match the List-I with List-II and select the correct answer using the codes given below the lists.
    List IList II
    A. Coagulation1. Scattering
    B. Lyophilization2. Washing of precipitates
    C. Peptization3. Purification of colloids
    D. Tyndall effect4. Electrolyte
    Solution
    (A) Addition of an electrolyte causes coagulation as a result of the preferential adsorption of the ions of charge opposite to that on the colloidal particle.

    (B) Lyophilization is a method of purification of colloids. Other methods include dialysis, ultrafiltration, and ultracentrifugation.

    (C) Peptization is the process by which a coagulated precipitate is returned to its colloidal state. eptization can be minimized by washing a precipitate with a solution of an electrolyte that is volatilized during an ensuing drying step.

    (D) Tyndall effect is light scattering by particles in a colloid or in a very fine suspension.
  • Question 10
    1 / -0
    Purple of cassius is:
    Solution
    Purple of Cassius is a purple pigment formed by the reaction of gold salts with tin(II) chloride which is a colloidal solution of gold.
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