Classification of Colloids

IMPORTANT

Classification of Colloids: Overview

This Topic covers sub-topics such as Sol, Foam, Gel, Aerosol, Kraft Temperature, Types of Gels, Solid Sol, Associated Colloids, Mechanism of Micelle Formation, Lyophilic Sols, Lyophobic Sols, Macromolecular Colloids and, Elastic Gels

Important Questions on Classification of Colloids

EASY
IMPORTANT

Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is:

MEDIUM
IMPORTANT

For micelle formation, which of the following statements are correct?

(A) Micelle formation is an exothermic process.

(B) Micelle formation is an endothermic process.

(C) The entropy change is positive.

(D) The entropy change is negative.

EASY
IMPORTANT

Match List-I with List-II

  List-I   List-II
(A) negatively charged sol (I) Fe2O3·xH2O
(B) macromolecular colloid (II) CdS sol
(C) positively charged sol (III) Starch
(D) Cheese (IV) a gel

Choose the correct answer from the options given below

HARD
IMPORTANT

Match List - I with List - II.

  List-I   List-II
A Lyophilic colloid I Liquid-liquid colloid
B Emulsion II Protective colloid
C Positively charged colloid III FeCl3+NaOH
D Negatively charged colloid IV FeCl3+ hot water

Choose the correct answer from the options given below

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Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because

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Which of the following about colloids is FALSE?

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Which of the following process not involved in surfactant molecules at CMC?

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Foam is formed when_______

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The charge of the colloidal solution is dependent on the electrical charge of the _____ .

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Lyophilic sols are more stable than lyophobic sols because:

EASY
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At high concentration of soap in water soap behaves as a

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In general, for soaps, the concentration of surfactant at CMC is around mol. L-1

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Tyndall effect is more effectively shown by:

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The sol given below with negatively charged colloidal particles is:

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An ionic micelle consists of as many as _____ such ions.

MEDIUM
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When silver nitrate solution is added to potassium iodide solution then the sol produced is:

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Match List I with List II :
    List-I                                  List-II

Example of colloids            Classification
(a) Cheese                   (i) dispersion of liquid in liquid
(b) Pumice stone         (ii) dispersion of liquid in gas
(c) Hair cream             (iii) dispersion of gas in solid
(d) Cloud                     (iv) dispersion of liquid in solid

Choose the most appropriate answer from the options given below

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Blood contains:

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The colloidal system consisting of a liquid adsorbate in a solid adsorbent is termed as

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Black diamonds are the dispersion of