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Surface Chemistry Test - 33

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Surface Chemistry Test - 33
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Colloidal solutions of metals like $$Cu,Ag,Au$$ and $$Pt$$ are generally prepared by using:
    Solution
    Colloidal solutions of metals are generally prepared by Bredig's arc method in which an arc is struck between the metal electrodes under the surface of water containing some stabilizing agents such as a track of $$KOH$$.
  • Question 2
    1 / -0
    Detergent action of synthetic detergents is due to their:
  • Question 3
    1 / -0
    Which of the following process is responsible for the digestion of fat in out intestine?
    Solution
    As shown in figure, Emulsification is the process whereby large globules of fat are broken down into smaller globules and made water soluble, Thus this process is only responsible for the digestion of fat in out intestine.
    while electrophoresis     used for both DNA and RNA analysis, Demulsifiers used to separate emulsions, for example, water in oil and Paptization is a process of passing of a precipitate into colloidal particles on adding suitable electrolyte.

    Thus option C is correct answer. 
  • Question 4
    1 / -0

    Directions For Questions

    Emulsions are also the colloidal solutions in which disperse phase, as well as a dispersion medium, are liquids. It may be oil in water or water in oil type. Bancroft proposed that the phase in which the emulsion. Emulsifiers can be used to stabilize the emulsions. The emulsifier is more soluble becomes the outer phase of the emulsion. Emulsifiers can be used to stabilize the emulsion. Soaps, detergents, proteins, and gum etc., are used as emulsifiers.

    ...view full instructions

    Emulsions can be destroyed by:
    Solution
    $$\text{Electrophoresis is a technique commonly used in the lab to separate charged molecules.}$$
  • Question 5
    1 / -0
    The colloidal sol found effective in the treatment of eye disease is:
    Solution

    Colloidal silver has also been said to help prevent eye infections in infants when colloidal silver eye drops are used. It is also used for medical purposes including as disinfectants and microbiocides. Silver has also been added to bandages and dressings, and to the coating of medical instruments.

  • Question 6
    1 / -0

    Directions For Questions

    Emulsions are also the colloidal solutions in which disperse phase, as well as a dispersion medium, are liquids. It may be oil in water or water in oil type. Bancroft proposed that the phase in which the emulsion. Emulsifiers can be used to stabilize the emulsions. The emulsifier is more soluble becomes the outer phase of the emulsion. Emulsifiers can be used to stabilize the emulsion. Soaps, detergents, proteins, and gum etc., are used as emulsifiers.

    ...view full instructions

    Substance that allow oil and water to mix, or emulsify, is known as_____
    Solution
    An emulsion is a colloidal system consisting of immiscible liquids. 
    For example, milk is an emulsion in which particles of liquid fat are dispersed in water. In common occurrence, however, one of the liquids is water and the other oily substance insoluble in it. The suspended droplets are larger than the particles of the sols. It is because of the density differences between the phases being small. Emulsion droplets can be observed under an ordinary microscope and sometimes, even with a magnifying lens.
    Addition of lyophilic solution to the emulsion forms a protective film around the dispersed phase.
  • Question 7
    1 / -0

    Directions For Questions

    Emulsions are also the colloidal solutions in which disperse phase, as well as a dispersion medium, are liquids. It may be oil in water or water in oil type. Bancroft proposed that the phase in which the emulsion. Emulsifiers can be used to stabilize the emulsions. The emulsifier is more soluble becomes the outer phase of the emulsion. Emulsifiers can be used to stabilize the emulsion. Soaps, detergents, proteins, and gum etc., are used as emulsifiers.

    ...view full instructions

    Which of the following examples is/are oil in water type emulsions?
    Solution
    Soap is foam in which disperse phase is gas and dispersion medium is liquid. Ink is a solution in which disperse phase is solid and dispersion medium is liquid.
    But as per 1st line of passage, the colloidal solutions in which disperse phase as well as dispersion medium are liquids, are emulsions, Milk is colloidal solutions in which disperse phase as well as dispersion medium are liquids, Thus Milk is emulsion.

    Thus Option D is correct answer.
  • Question 8
    1 / -0
    Adsorption is the phenomenon in which a substance:
    Solution

    Explanation:

    • Adsorption is the phenomenon in which one substance accumulates on the surface of the other substance.
    • The surface on which adsorption takes place is adsorbent.
    • The substances which accumulate on adsorbents are adsorbates.

    Hence, the correct answer is option $$A$$.

  • Question 9
    1 / -0
    Select the correct statement from the following.
    Solution

    $$\bullet \quad $$Addition of Catalyst has no effect on the value of equilibrium constant.

    $$\bullet \quad $$Catalyst increases the rate of forward and backward reaction in equal proprtional.

    $$\bullet \quad $$The ratio of mixture at equilibrium does not change by catalyst.

    $$\bullet \quad $$Catalyst may be of solid, liquid or gaseous state.
  • Question 10
    1 / -0
    A poisonous gas is adsorbed at activated charcoal. The activated charcoal is:
    Solution

    Adsorption is the adhesion of molecules of gas, liquid, or dissolved solid particles on to the surface. In this process a layer of the adsorbate the molecules or atoms being accumulated on the surface of the adsorbent.

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