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Surface Chemistry · Question 13

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 25% papers+4−1
1

Which property of colloidal solution is independent of charge on the colloidal particles?

  1. Electro-osmosis
  2. Tyndall effect
  3. Coagulation
  4. Electrophoresis

Answer

(2) Tyndall effect

Solution

As per NCERT, the Tyndall effect is the scattering of light by colloidal particles; it is observed only when the diameter of the dispersed particles is not much smaller than the wavelength of the light used and the refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

⇒ It depends on particle size, not on charge.

∵ Electrophoresis and electro-osmosis are movements under an electric field due to charge, and coagulation is the neutralisation of the charge on the particles.

∴ Tyndall effect is independent of the charge on colloidal particles.

Answer: (2)

Out of syllabusAIPMT 2015 (Cancelled)

Keep practising — Surface Chemistry

2

Which of the following statements is correct for the spontaneous adsorption of a gas?

  1. is negative and, therefore, should be highly positive.
  2. is negative and, therefore, should be highly negative.
  3. is positive and, therefore, should be negative.
  4. is positive and, therefore, should also be highly positive.
AIPMT 2014
3

Which property of colloids is not dependent on the charge on colloidal particles?

  1. Coagulation
  2. Electrophoresis
  3. Electro-osmosis
  4. Tyndall effect
Out of syllabusAIPMT 2014
4

In Freundlich adsorption isotherm, the value of 1n is

  1. between 0 and 1 in all cases
  2. between 2 and 4 in all cases
  3. 1 in case of physical adsorption
  4. 1 in case of chemisorption.
Out of syllabusAIPMT 2012 (Prelims)
5

Which one of the following statements is incorrect about enzyme catalysis?

  1. Enzymes are mostly proteinous in nature.
  2. Enzyme action is specific.
  3. Enzymes are denatured by ultraviolet rays and at high temperature.
  4. Enzymes are least reactive at optimum temperature.
Out of syllabusAIPMT 2012 (Prelims)
6

The protecting power of lyophilic colloidal sol is expressed in terms of

  1. coagulation value
  2. gold number
  3. critical micelle concentration
  4. oxidation number
Out of syllabusAIPMT 2012 (Prelims)
7

If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?

  1. x/m = f(p) at constant T
  2. x/m = f(T) at constant p
  3. p = f(T) at constant (x/m)
  4. xm = p T
Out of syllabusAIPMT 2011 (Prelims)
8

The Langmuir adsorption isotherm is deduced using the assumption

  1. the adsorption sites are equivalent in their ability to adsorb the particles
  2. the heat of adsorption varies with coverage
  3. the adsorbed molecules interact with each other
  4. the adsorption takes place in multilayers
Out of syllabusAIPMT 2007
9

A plot of (x/m) versus p for the adsorption of a gas on a solid gives a straight line with slope equal to

  1. K
  2. - K
  3. n
  4. 1/n
Out of syllabusAIPMT 2006
10

Which one of the following forms micelles in aqueous solution above certain concentration?

  1. Dodecyl trimethyl ammonium chloride
  2. Glucose
  3. Urea
  4. Pyridinium chloride
Out of syllabusAIPMT 2005
11

Which of the following forms cationic micelles above certain concentration?

  1. Sodium dodecyl sulphate
  2. Sodium acetate
  3. Urea
  4. Cetyltrimethylammonium bromide.
Out of syllabusAIPMT 2004

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