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Surface Chemistry Test - 15

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Surface Chemistry Test - 15
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which gas will be adsorbed on a solid to greater extent.

    Solution

    A gas with high critical temperature has high vander waal force due to which they are more easily liquefiable & hence more easily adsorb as adsorption decreases  their energy

  • Question 2
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    Which of the following factors affects the adsorption of a gas on solid ?

    Solution

    Extent of adsorption increase with increase in critical temperature

  • Question 3
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    The volume of gases NH3, CO2 and CH4 adsorbed by one gram of charcoal at 298 K are in

    Solution

    Extent of adsorption & intermoleculer force ∞ vander waal const. (a) NH3 > CO2 > CH4

  • Question 4
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    The heat of physisorption lie in the range of

    Solution

    Refer theory

  • Question 5
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    Which of the following is not a gel ?

    Solution

    Milk is emulsion

  • Question 6
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    Which of the following is used to adsorb water

    Solution

    H2O + SiO2 → SiO2. xH2O
    Sillica gel

  • Question 7
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    An emulsion is colloidal system of

    Solution

    Emulsion :- (ℓ + ℓ) dispersed phase & dispersion medium both are liquid

  • Question 8
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    Which of the following is a lyophobic colloid ?

    Solution

    Gelation, starch & gum are organic in nature & hence lyophilic in nature but S8 is inorganic in nature & hence lyophobic in nature

  • Question 9
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    The nature of bonding forces in adsorption

    Solution

    Vander waal force is responsible for adsorption.

  • Question 10
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    The Tyndall effect associated with colloidal particles is due to

    Solution

    Tyndall effect is due to scattering of light

  • Question 11
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    Which one of the following is not applicable to chemisorption ?

    Solution

    Chemisorption is irreversible in nature because in chemisorption there are strong covalent bond are formed which do not brake easily to separate the reactants because of this it has high heat of adsorption, takes place at high temperatures and forms monolayers.

  • Question 12
    1 / -0

    In the colloidal state the particle size ranges

    Solution

    Colloidal range of particle is 1nm-1000 nm

  • Question 13
    1 / -0

    All colloids

    Solution

    colloids are heterogeneous in nature & hence consist of two phase.

  • Question 14
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    Colloids can be purified by

    Solution

    Refer theory

  • Question 15
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    Milk is an example of

    Solution

    Milk is emulsion (butter fat dispersed in water).

  • Question 16
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    Colloidal particles in a sol. can be coagulated by

    Solution

    The correct answer is option  D

    Stability of the lyophobic sols is due to presence of charge on colloidal particles. If charge is removed, particles come together and settle down. Spontaneous destabilization of solution is ageing and destabilization of solution by artificial means is called coagulation.
    Methods of coagulation are as follows:
    1. Boiling
    2. Dialysis
    3. Addition of electrolytes
    4. Mixing two oppositely charged sols
    5. Electrophoresis

  • Question 17
    1 / -0

    Fog is a colloidal system of

    Solution

    Fog (liquid + gas) dispersed phase Dispersion medium.

  • Question 18
    1 / -0

    Given below are a few electrolytes, indicates which one among them will bring about the coagulation of a gold sol. quickest and in the least of concentration ?

    Solution

    As per Hardy shulze rule coagulation power a +ve charge which is maximum in Al3+.

  • Question 19
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    When a colloidal solution is observed under ultramicroscope, we can see

    Solution

    Ultra–microscope is based on tyndall effect which is based on scattering of light.

  • Question 20
    1 / -0

    Colloidal solution are classified on the basis of

    Solution

    Molecular size for colloidal range in 1nm–1000 nm.

  • Question 21
    1 / -0

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

    Solution

    Refer theory

  • Question 22
    1 / -0

    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 23
    1 / -0

    Smoke precipitator works on the principle of

    Solution

    Neutralization of charge on colloid as per hardy shulze rule.

  • Question 24
    1 / -0

    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 25
    1 / -0

    As2S3 sol is

    Solution

    As2S3 colloid can be represented as As2S3 s2–
    so it is negatively charged.

  • Question 26
    1 / -0

    Crystalloids differ from colloids mainly in respect of

    Solution

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

  • Question 27
    1 / -0

    At the critical micelle concentration (CMC) the surfacent molecules

    Solution

    Micelle is a associated form of colloid

  • Question 28
    1 / -0

    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 29
    1 / -0

    Solute dispersed in ethanol is called

    Solution

    Ethanol is alcohol to the colloidal system is called alcosols.

  • Question 30
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    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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