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Surface Chemistry

AIPMT 2007MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2007

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

Answer

(1) the adsorption sites are equivalent in their ability to adsorb the particles

Solution

Assumptions of the Langmuir adsorption isotherm:

(i) The surface is uniform: all adsorption sites are equivalent, and each site holds only one molecule.

(ii) Adsorption is monolayer (unimolecular), not multilayer.

(iii) Adsorbed molecules do not interact with each other.

(iv) Hence the heat of adsorption is the same for every site and does not vary with surface coverage.

⇒ Options (2), (3) and (4) contradict these assumptions.

∴ The isotherm assumes that the adsorption sites are equivalent in their ability to adsorb the particles.

Answer: (1)

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Ques. 2AIPMT 2006

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
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Ques. 3AIPMT 2005

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 syllabus
Ques. 4AIPMT 2004

Which of the following forms cationic micelles above certain concentration?

  1. Sodium dodecyl sulphate
  2. Sodium acetate
  3. Urea
  4. Cetyltrimethylammonium bromide.
Out of syllabus
Ques. 5AIPMT 2003

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.
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Ques. 6AIPMT 2002

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
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Ques. 7AIPMT 2001

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.
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Ques. 8AIPMT 2000

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 syllabus

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