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Set 9 of 9 · Questions 241-248 of 248

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JEE Main Chemistry · Surface Chemistry · Set 9 (Q241-248)

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  1. 241.
    For the conversion of oxygen to ozone in the atmosphere, nitric oxide in gaseous phase acts as
    1. (1)enzyme catalyst
    2. (2)homogeneous catalyst
    3. (3)heterogeneous catalyst
  2. 242.
    The Tyndall effect is observed only when following conditions are satisfied
    (A) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
    (B) The diameter of the dispersed particles is not much smaller than the wavelength of the light used
    (C) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
    (D) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.
    1. (1)(B) AND (D)
    2. (2)(A) AND (C)
    3. (3)(B) AND (C)
    4. (4)(A) AND (D)
  3. 243.
    Adsorption theory is applicable for
    1. (1)homogeneous catalysis
    2. (2)heterogeneous catalysis
    3. (3)autocatalysis
    4. (4)induced catalysis.
  4. 244.
    An example of solid sol is:
    1. (1)Butter
    2. (2)Hair cream
    3. (3)Paint
    4. (4)Gem stones
  5. 245.
    An example of solid sol is:
    1. (1)Paint
    2. (2)Gem stones
    3. (3)Butter
    4. (4)Hair cream
  6. 246.
    Identify the correct statements from the following:
    I. Sulphur sol is an example of a multimolecular colloid.
    II. Tyndall effect is observed when the diameter of the dispersed particles is not much smaller than the wavelength of the light used.
    III. The process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane is called peptisation.
    IV. Eosin, gelatin are examples of negatively charged sols.
    1. (1)I, II, III
    2. (2)I, II, IV
    3. (3)I, III, IV
    4. (4)II, III, IV
  7. 247.
    All colloidal dispersions have
    1. (1)very high osmotic pressure
    2. (2)low osmotic pressure
    3. (3)no osmotic pressure
    4. (4)high osmotic pressure.
  8. 248.
    Reactions in zeolite catalyst depend on
    1. (1)pores
    2. (2)apertures
    3. (3)size of cavity
    4. (4)all of these.