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Test: Types of Colloids


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Test: Types of Colloids - Question 1

Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloidal sols are divided in how many categories?

Detailed Solution for Test: Types of Colloids - Question 1

Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloidal sols are divided into two categories, namely, lyophilic (solvent attracting) and lyophobic (solvent repelling).

Test: Types of Colloids - Question 2

When do particles aggregate to form micelles?

Detailed Solution for Test: Types of Colloids - Question 2

The correct answer is Option D.
In high concentration, particles aggregate to form micelles; it happens above Tk called kraft’s temperature and critical micelle concentration (CMC). If the concentration is low and it forms a true solution.

Test: Types of Colloids - Question 3

Foam rubber is an example of which type of colloid?

Detailed Solution for Test: Types of Colloids - Question 3

Test: Types of Colloids - Question 4

An example of colloid in which both phase and medium are solid is?

Detailed Solution for Test: Types of Colloids - Question 4

The correct answer is Option D.

 

Test: Types of Colloids - Question 5

The name aquadag is given to the colloidal sol of:

Detailed Solution for Test: Types of Colloids - Question 5

The correct answer is Option C.

Aquadag is the name of a water-based colloidal graphite coating which is a colloidal solution of graphite in water.

Test: Types of Colloids - Question 6

Which method is used for preparation of metal sols?

Detailed Solution for Test: Types of Colloids - Question 6

The correct answer is Option A
The method of preparation of colloidal solutions of metals such as platinum, gold or silver is known as Bredig's arc method or Electrical disintegration.

 It consists of both dispersion and condensation. It can not be used to prepare a colloidal solution of copper and sodium.

Test: Types of Colloids - Question 7

The formation of micelles takes places above a particular temperature, called as:

Detailed Solution for Test: Types of Colloids - Question 7

The correct answer is Option B. 

Associated colloids are substances which at low concentrations behave as normal strong electrolytes, but at higher concentrations exhibit colloidal behaviour due to the formation of aggregates. 
The aggregated particles thus formed are called micelles. 
The formation of micelles takes place only above a particular temperature called Kraft temperature (Tk) and above a particular concentration called critical micelle concentration (CMC).

Test: Types of Colloids - Question 8

Rotation at high speed makes the colloid settle down and the impurities remain in solution. What is this process called?

Detailed Solution for Test: Types of Colloids - Question 8

The correct answer is Option A.
Ultracentrifugation involves the separation of colloidal particles from the impurities by centrifugal force.
The impure sol is taken in a tube and the tube is placed in an ultracentrifuge. The tube is rotated at high speeds.
On account of this, the colloidal particles settle down at the bottom of the tube and the impurities remain in the solution.
This solution is termed as centrifugate. The settled colloidal particles are removed from the tube and are mixed with an appropriate dispersing medium. Thus, the pure sol is obtained.

Test: Types of Colloids - Question 9

A dispersion of AgCl in water is:

Detailed Solution for Test: Types of Colloids - Question 9

The correct answer is Option A.
AgCl being a covalent molecule is insoluble in water and hence hydrophobic.
 

Test: Types of Colloids - Question 10

Blood is purified by:

Detailed Solution for Test: Types of Colloids - Question 10

The correct answer is Option A.

Blood is a colloidal which contains crystalloids as impurity hence can be separated by Dialysis.

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