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Surface Chemistry · Question 27

AIPMT 2000MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(4) By adding electrolyte

Solution

∵ The stability of a lyophobic sol is due to the like charge on its particles, which keeps them apart.

⇒ On adding an electrolyte, the oppositely charged ions neutralise the charge on the colloidal particles.

⇒ The particles come together, grow in size and settle down — this is coagulation (destruction) of the colloid.

∴ Dialysis and ultrafiltration purify a sol, and condensation is a method of preparing one.

Answer: (4)

Out of syllabusAIPMT 2000

Keep practising — Surface Chemistry

2

Which one is an example of heterogeneous catalysis?

  1. Hydrolysis of sugar catalysed by H+ ions.
  2. Decomposition of ozone in presence of nitrogen monoxide.
  3. Combination between dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron.
  4. Oxidation of sulphur dioxide into sulphur trioxide in the presence of oxides of nitrogen.
Out of syllabusNEET (UG) 2023
3

Pumice stone is an example of -

  1. gel
  2. solid sol
  3. foam
  4. sol
Out of syllabusNEET (UG) 2023
4

Given below are two statements In the light of the above statements, choose the most appropriate answer from the options given below

  1. Both Statement I and Statement II are correct.
  2. Both Statement I and Statement II are incorrect.
  3. Statement I is correct but Statement II is incorrect.
  4. Statement I is incorrect but Statement II is correct.
Out of syllabusNEET (UG) 2022
5

Shown below are adsorption isotherms for a gas 'X' at temperatures T1, T2 and T3 : [figure] p and xm represent pressure and extent of adsorption, respectively. The correct order of temperatures for the given adsorption is :

  1. T1 = T2 > T3
  2. T1 > T2 > T3
  3. T3 > T2 > T1
  4. T1 = T2 = T3
Out of syllabusNEET (UG) 2022 (Phase 2)
6

The right option for the statement "Tyndall effect is exhibited by", is :

  1. Urea solution
  2. NaCl solution
  3. Glucose solution
  4. Starch solution
Out of syllabusNEET (UG) 2021
7

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
Out of syllabusNEET (UG) 2020
8

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
9

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
10

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
11

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)

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