Properties of Colloids, Class 12 Chemistry NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. When colloids are subjected to an electrical field particles move towards an electrode and precipitate. Name the process.

 Peptization

  Electrophoresis

 Brownian movement

 Tyndal effect

Question 1 of 20

2. Which property is represented by the following figure;

 electrophoresis

 tyndal effect

 Brownian movement

 peptization

Question 2 of 20

3. Which law is represented by the following expression?
For a positive colloid the order of precipitation is : Phosphate ion>sulphate ion >chloride ion.

  Brownian

 Electrical movement

  Hardy Schulze

  Tyndal

Question 3 of 20

4. Which substance is added to water containing suspended impurities to coagulate the suspended impurities and make water fit for drinking purposes.

 Milk of magnesia

 KCl

 NaCl

  Alum

Question 4 of 20

5. The simplest way to check whether a system is a colloid is by using:

  Brownian movement

 Tyndall effect

  Electrodialysis

 Finding out particle size

Question 5 of 20

6. Which method cannot be used for the coagulation of the lyophobic sol?

  By persistent dialysis

 By boiling

 Electroosmosis

 By electrophoresis

Question 6 of 20

7. Lyophilic colloids that shows the property of protecting lyophobic colloids are also called as:

  Protective colloids

 Non-Protective colloids

  Both protective and non protective

 Associated colloids

Question 7 of 20

8. Which of the following forms a colloidal solution in water?

 A

 B

 C

 D

Question 8 of 20

9. The factors which are responsible for the stability of lyophilic sols are:

 Size of the colloidal particles

 Charge of the colloidal particles

 Charge and solvation of the colloidal particles

 Solvation of the colloidal particles

Question 9 of 20

10. The Brownian motion is due to:

 Impact of molecules of the dispersion medium on the colloidal particles

 Convective currents

 Temperature fluctuation within the liquid phase

 Attraction and repulsion between charges on the colloidal particles

Question 10 of 20

11. Which property of colloids is applied in rubber plating & sewage disposal?

 Peptization

 Brownian movement

 Tyndal effect

 Electrophoresis

Question 11 of 20

12. In Tyndall effect the colloidally suspended particles:

  trace out the path of strong beam of light

 show electrophoresis

 show Brownian movement

 coagulate

Question 12 of 20

13. Ferric hydroxide is a negative sol, which of the following electrolyte will coagulate it most:

 FeCl₃

 CaCO₃

 BaSO₄

 NaCl

Question 13 of 20

14. What is aggregation of colloidal particles into insoluble precipitate by addition of some suitable electrolyte called?

 Coagulation

 Dialysis

 Peptization

  Emulsion

Question 14 of 20

15. A fresh precipitate can be transformed into colloidal sol by:

 Peptization

 Coagulation

 Diffusion

 None of these

Question 15 of 20

16. Which statement describes coagulation value?

  Maximum amount (in millimoles) of electrolyte required to cause complete coagulation in one kilo gram of colloidal solution

 Minimum amount (in kg) of electrolyte required to cause complete coagulation in one litre colloidal solution

 Maximum amount (in millimoles) of electrolyte required to cause complete coagulation in one litre colloidal solution

  Minimum amount (in millimoles) of electrolyte required to cause complete coagulation in one litre colloidal solution

Question 16 of 20

17. Which electrolyte will precipitate a negatively charged colloids (As₂S₃ sol ) to a greater extend?

  Na⁺

 Ba²⁺

 Fe²⁺

  Fe³⁺

Question 17 of 20

18. The process in which colloid is placed inside a bag of semi permeable membrane like cellophane or parchment paper which permits ions and not colloids to pass through, is called as:

 Peptization

 Emulsion

 Coagulation

 Dialysis

Question 18 of 20

19. Which of the following will have the highest coagulating power for As₂S₃ colloids?

 A

 B

 C

 D

Question 19 of 20

20. What is scattering of light by mist on head light of vehicles called?

  Peptization

  Electrophoresis

 Brownian movement

 Tyndal effect

Question 20 of 20

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