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Emulsions and Gels. - Free MCQ Practice Test with solutions, JEE Chemistry


MCQ Practice Test & Solutions: Test: Emulsions and Gels. (15 Questions)

You can prepare effectively for JEE Chemistry for JEE Main & Advanced with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Emulsions and Gels.". These 15 questions have been designed by the experts with the latest curriculum of JEE 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 15

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Test: Emulsions and Gels. - Question 1

white precipitate of is peptized with di. . The sol particle will carry

Detailed Solution: Question 1


(Positive charge)

Test: Emulsions and Gels. - Question 2

The gold numbers of protective colloids and are and 40 respectively. The protective powers of and are in the order :

Detailed Solution: Question 2

Smaller is the 'gold number' of protective colloid, greater is its protective power.

Test: Emulsions and Gels. - Question 3

In an experiment, addition of of to of arsenius sulphide sol just causes the complete coagulation in . The flocculating value of the effective ion is

Detailed Solution: Question 3

sol is negatively charged owing to preferential adsorption of ions. Cation would be the effective ion in coagulation. Flocculating value minimum milli mol of the effective ion per litre of sol = 

Test: Emulsions and Gels. - Question 4

Arrange the following electrolytes in the increasing order of coagulating power for ferric hydroxide sol

Detailed Solution: Question 4

Ferric hydroxide sol is positively charged and hence anions would be effective in causing coagulation. Greater the valence of the effective ion, more will be its coagulating power.

Test: Emulsions and Gels. - Question 5

Which one of the sols acts as protective colloid?

Detailed Solution: Question 5

Gelatin act as protective colloids.

Test: Emulsions and Gels. - Question 6

Given below are a few electrolytes, indicate which one among them will bring about the coagulation of a gold sol quickest and in the least of concentration?

Detailed Solution: Question 6

Gold sol. have negative charge. So is most effective for coagulation.

Test: Emulsions and Gels. - Question 7

Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using , and solutions. Their coagulating values will be in maximum for:

Detailed Solution: Question 7

The sol particles migrate towards cathode. So they are positively charged. Hence, anions would be effective in coagulation. Greater is the valence of effective ion
smaller will be its coagulating value.

Test: Emulsions and Gels. - Question 8

The process of converting a precipitate into colloidal solution is known as

Detailed Solution: Question 8

Precipitate colloidal solution
Colloidal solution precipitate

Test: Emulsions and Gels. - Question 9

For  sol, the most effective coagulating agent is

Detailed Solution: Question 9

According to the Hardy-Schulze rule, the coagulating power of an ion is directly proportional to charge on the ion. Higher the charge on coagulating ion, higher is the coagulating power.
 is a negatively charged sol, therefore positively charged ion is required to coagulate it. Hence,  has the maximum coagulating power.

Test: Emulsions and Gels. - Question 10

Coagulation value of the electrolytes and for sol are and 52 respectively. How many times has greater coagulating power than ?

Detailed Solution: Question 10


Test: Emulsions and Gels. - Question 11

The protecting power of lyophilic colloidal sol is expressed in terms of :

Detailed Solution: Question 11

The lyophobic sols are less stable than lyophilic sols. The lyophilic sols are thus used to protect the lyophobic sols. This property of lyophilic sols is known as protective action of lyophilic sols which is represented by gold number.

Test: Emulsions and Gels. - Question 12

Which property of colloids is not dependent on the charge of colloidal particles?

Detailed Solution: Question 12

Tyndall effect is optical property, whereas other properties are electrical properties. Hence dependent on the charge on colloids

Test: Emulsions and Gels. - Question 13

A thixotropic gel is characterised by

Detailed Solution: Question 13

Thixotropic gel changes into sol on mechanical agitation, which on standing sets to gel.

Test: Emulsions and Gels. - Question 14

Which of the following is most powerful to coagulate the negative colloid?

Detailed Solution: Question 14

According to Hardy-Schulze rule "The amount of electrolyte required to coagulate a fixed amount of a sol depends upon the sign of charge and valency of the flocculating ion." Thus, the coagulating power vary in the order.

Test: Emulsions and Gels. - Question 15

Point out the false statement

Detailed Solution: Question 15

Liquid - liquid system is known as emulsion.

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