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Surface Chemistry

NEET 2016 (Phase 2)MCQEasy📈 Topic in 25% papers+4−1
Ques. 1NEET 2016 (Phase 2)

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below : I. (NaCl) = 52, II. (BaCl2) = 0.69, III. (MgSO4) = 0.22 The correct order of their coagulating power is

  1. I > II > III
  2. II > I > III
  3. III > II > I
  4. III > I > II

Answer

(3) III > II > I

Solution

The minimum concentration of an electrolyte (in millimoles per litre) required to cause coagulation of a sol in two hours is its coagulation value.

Coagulating power 1coagulation value

Coagulation values: III (0.22) < II (0.69) < I (52)

Coagulating power: III > II > I

Answer: (3)

Out of syllabus

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Ques. 2AIPMT 2015 (Cancelled)

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

  1. Electro-osmosis
  2. Tyndall effect
  3. Coagulation
  4. Electrophoresis
Out of syllabus
Ques. 3AIPMT 2014

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.
Ques. 4AIPMT 2014

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 syllabus
Ques. 5AIPMT 2012 (Prelims)

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 syllabus
Ques. 6AIPMT 2012 (Prelims)

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 syllabus
Ques. 7AIPMT 2012 (Prelims)

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 syllabus
Ques. 8AIPMT 2011 (Prelims)

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 syllabus
Ques. 9AIPMT 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
Out of syllabus
Ques. 10AIPMT 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
Out of syllabus
Ques. 11AIPMT 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

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