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Why is it important to have clean surfac...

Why is it important to have clean surface in surface studies ?

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Knowledge Check

  • Why is it important to have iodised salt in our diet?

    A
    It improves eye sight
    B
    It helps in smooth functioning of the thyroid gland
    C
    It helps in building bones
    D
    It helps in gaining height

  • The adsorption of vapours on a clean surface is a spontaneous process because

    A
    change in the entropy of the process is highly positive
    B
    enthalpy change is highly positive
    C
    change in entropy is zero
    D
    change in enthalpy is highly negative

  • The surface of srystals can be studied using

    A
    diffraction of visible light
    B
    diffraction of x-rays
    C
    interference of sound waves
    D
    refraction of radio waves

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    Hydrochloric acid is used to clean the metal surface before the metal surface is subjected to galvanisation. Explain.

    Hydrochloric acid is used to clean the metal surface before the metal surface is subjected to galvanisation. Explain.

    Explain why (a) The angle of contact of mercury with glass is obtuse, while that of water with glass is acute. Explain. (b) Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (c ) Surface tension of liquid is independent of the area of the liquid surface. (d) Detergents should have small angles of contact. (e ) A dorp of liquid under no external force is always spherical in shape.

    Gases do not have free surfaces. Explain.

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