Surface Chemistry

Short Answer Type

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State one difference betwen an emulsion and a sol.

Answer:

In sol dispersed medium is liquid and dispersed phase is solid. for example paints, cell fluid

In emulsion both dispersed phase and dispersion phase are in liquid foam. for example milk,butter.

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    Out of NH3 and N2 which gas will be adsorbed more readily on the surface of charcoal and why?
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    Multiple Choice Questions

    The Brownian motion is due to
    • Temperature fluctuation within the liquid phase
    • Attraction and repulsion between charges on the colloidal particles
    • Impact of molecules of the dispersion medium on the colloidal particles
    • Convection currents
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    Short Answer Type

    Define enthalpy of adsorption.
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    Multiple Choice Questions

    The sky looks blue due to
    • dispersion effect 
    • Reflection
    • Transmission
    • Scattering
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    Short Answer Type

    Tyndall effect is due to?
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    What is the cause of Brownian movement observed in colloidal solution?
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    How can colloidal solution of sulphur in water be prepared?
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    Multiple Choice Questions

    The blue colour of water in the sea is due to
    • Refraction of the blue light by the impurities in sea water.
    • Reflection of blue sky by sea water.
    • Scattering of blue light by water molecules.
    • Absorption of other colours except blue colour by water molecules.
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    According to Langmuir absorption isotherm, the amount of gas adsorbed at very high pressures
    • reaches a constant limiting value
    • goes on increasing with pressure
    • goes on decreasing with pressure
    • increases first and decreases later with pressure
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