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Surface Chemistry · Question 18

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(2) gold number

Solution

Gold number is the minimum mass (in mg) of a lyophilic colloid which, when added to 10 mL of a standard gold sol, just prevents its coagulation on adding 1 mL of 10% NaCl solution.

The smaller the gold number, the greater is the protecting power of the lyophilic colloid.

Answer: (2)

Out of syllabusAIPMT 2012 (Prelims)

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2

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)
3

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
4

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
5

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
6

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
7

According to the adsorption theory of catalysis, the speed of the reaction increases because

  1. the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
  2. in the process of adsorption, the activation energy of the molecules becomes large
  3. adsorption produces heat which increases the speed of the reaction
  4. adsorption lowers the activation energy of the reaction.
Out of syllabusAIPMT 2003
8

Position of non-polar and polar part in micelle

  1. polar at outer surface but non-polar at inner surface
  2. polar at inner surface but non-polar at outer surface
  3. distributed over all the surface
  4. are present in the surface only
Out of syllabusAIPMT 2002
9

Which is not correct regarding the adsorption of a gas on surface of a solid?

  1. On increasing temperature adsorption increases continuously.
  2. Enthalpy and entropy change is negative.
  3. Adsorption is more for some specific substance.
  4. It is a reversible reaction.
Out of syllabusAIPMT 2001
10

Which one of the following methods is commonly used for the destruction of a colloid?

  1. Dialysis
  2. Condensation
  3. Filtration by animal membrane
  4. By adding electrolyte
Out of syllabusAIPMT 2000

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