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Surface Chemistry · Question 6

NEET (UG) 2020MCQEasy📈 Topic in 25% papers+4−1
1

Measuring Zeta potential is useful in determining which property of colloidal solution?

  1. Solubility
  2. Stability of the colloidal particles
  3. Size of the colloidal particles
  4. Viscosity

Answer

(2) Stability of the colloidal particles

Solution

The potential difference between the fixed layer and the diffused layer of opposite charges around a colloidal particle is called the electrokinetic potential or zeta potential.

The charge on the colloidal particles (measured by the zeta potential) keeps them apart and prevents coagulation; a higher zeta potential means a more stable sol.

∴ Zeta potential is a measure of the stability of the colloidal particles.

Answer: (2)

Out of syllabusNEET (UG) 2020

Keep practising — Surface Chemistry

2

Which mixture of the solution will lead to the formation of negatively charged colloidal [AgI] I- sol. ?

  1. 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI
  2. 50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI
  3. 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI
  4. 50 mL of 1 M AgNO3 + 50 mL of 2 M KI
Out of syllabusNEET (UG) 2019
3

On which of the following properties does the coagulating power of an ion depend?

  1. The magnitude of the charge on the ion alone
  2. Size of the ion alone
  3. Both magnitude and sign of the charge on the ion
  4. The sign of charge on the ion alone
Out of syllabusNEET 2018
4

Which one of the following statements is not correct?

  1. The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.
  2. Enzymes catalyse mainly bio-chemical reactions.
  3. Coenzymes increase the catalytic activity of enzyme.
  4. Catalyst does not initiate any reaction.
Out of syllabusNEET 2017
5

Fog is a colloidal solution of

  1. solid in gas
  2. gas in gas
  3. liquid in gas
  4. gas in liquid.
Out of syllabusNEET 2016 (Phase 1)
6

Which one of the following characteristics is associated with adsorption?

  1. G and H are negative but S is positive.
  2. G and S are negative but H is positive.
  3. G is negative but H and S are positive.
  4. G, H and S all are negative.
Out of syllabusNEET 2016 (Phase 1)
7

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
Out of syllabusNEET 2016 (Phase 2)
8

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 syllabusAIPMT 2015 (Cancelled)
9

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
10

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
11

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)

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