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Surface Chemistry Test - 20

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Surface Chemistry Test - 20
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The substance that gets adsorbed on the surface of the solid is called?

    Solution

    The substance that gets adsorbed on the surface is known as adsorbate.

  • Question 2
    1 / -0

    Water vapours are adsorbed by

    Solution

    Water vapours gets adsorbed by Silica gel.

  • Question 3
    1 / -0

    Adsorption is accompanied by

    Solution

    Adsorption involve decrease in entropy because gas when gas adsorbed randomness decreases. Also it is exothermic process.

  • Question 4
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    The phenomenon in which adsorption and absorption takes place simultaneously is called?

    Solution

    Adsorption and absorption is commonly known as sorption.

  • Question 5
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    Which of the following is true about chemisorption?

    Solution

    Chemical Reaction take place between adsorbate and adsorbent in chemisorptions. Therefore it is specific in nature.

  • Question 6
    1 / -0

    The physical adsorption is due to

    Solution

    Vander waal forces are weak force of attractions, responsible for physisorption, as no chemical reaction taking place here.

  • Question 7
    1 / -0

    Substances that alter the rate of a chemical reaction without being used up in a chemical reaction is known as

    Solution

    Catalyst only increases or decreases the activation energy of a reaction, It doesnot get used up in reaction.

  • Question 8
    1 / -0

    Enzymes are

    Solution

    Enzymes are biological catalyst, they catalize different chemical reactions in body.

  • Question 9
    1 / -0

    The process of separation of colloids by passing through semi permeable membrane is called?

    Solution

    Dialysis we use, salt solution of approximately same concentration outside the artificial blood capillary, so that urea comes out of the blood, but other useful substances like NaCl , blood cell etc does not. Blood is a colloid.

  • Question 10
    1 / -0

    Liquid – liquid sols are known as

    Solution

    Liquid in liquid sols are emulsions

  • Question 11
    1 / -0

    Whipped cream is an example of

    Solution

    Whipped cream is example of foam.

  • Question 12
    1 / -0

    The curve showing the variation of adsorption with pressure at constant temperature is known as

    Solution

    Constant Temperature means isotherm.

  • Question 13
    1 / -0

    Which physical quantity remain unaffected when a reversible reaction is carried out in presence of a catalyst

    Solution

    Equillibrium constant is independent of catalyst. Catalyst doesnot change equilibrium constant.

  • Question 14
    1 / -0

    Adsorption is a

    Solution

    Adsorption is entirely a bulk phenomenon while absorption is bulk phenomenon.

  • Question 15
    1 / -0

    Which is correct in case of Vander waals adsorption?

    Solution

    Physiadsorption is favoured only at low temperature and high pressure.

  • Question 16
    1 / -0

    Which adsorption takes place at low temperature?

    Solution

    Physical adsorption is favoured at low temperature because it involves only vanderwall interactions between adsorbate and adsorbent.

  • Question 17
    1 / -0

    Pt and Pd adsorb large volume of hydrogen under specific conditions. The hydrogen so adsorbed is called?

    Solution

    Adsorption of hydrogen by metal like Pt is occlution and hydrogen is known as occluded hydrogen.

  • Question 18
    1 / -0

    Which of the following is not exhibited by sols?

    Solution

    Absorption, Tyndall effect and flocculation all are related to sol but paramagnetism is not represented by sol.

  • Question 19
    1 / -0

    Hydrophilic colloids are stable due to

    Solution

    This makes the colloid stable.

  • Question 20
    1 / -0

    Which of the following methods is used for sol destruction?

    Solution

    Electrolyte makes the colloid destroy.

  • Question 21
    1 / -0

    Flocculation value is expressed in terms of

    Solution

    Fact

  • Question 22
    1 / -0

    In aerosol the dispersion medium is

    Solution

    Dispersion medium is gas.

  • Question 23
    1 / -0

    Fog is a colloidal solution of

    Solution

    Dispersed phase is liquid, dispersion medium is gas.

  • Question 24
    1 / -0

    The basic principle of Cottrell precipitator is

    Solution

    It is used for decreasing air pollution by neutralizing the colloid.

  • Question 25
    1 / -0

    In which of the following systems, the dispersed phase and dispersion medium are both solid?

    Solution

    It is a Sol type of colloid.

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