Colloids and Their Properties
Chemistry ⇒ Solutions and Colloids
Colloids and Their Properties starts at 10 and continues till grade 12.
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Describe the role of emulsifying agents in the stability of emulsions.
Describe the Tyndall effect and give one example where it can be observed.
Explain the difference between lyophilic and lyophobic colloids.
Explain the term 'coagulation' of colloids and mention one method by which it can be brought about.
Explain the term 'protective colloid' and give an example.
Explain why colloidal solutions are stable to gravity but suspensions are not.
What is the charge on the colloidal particles in a gold sol prepared by the reduction method?
What is the typical size range (in nanometers) of colloidal particles?
Which of the following is a lyophilic colloid?
(1) Gold sol
(2) Starch sol
(3) Ferric hydroxide sol
(4) Sulphur sol
Which of the following is a method of preparation of colloidal sulphur?
(1) By reduction of sulphur dioxide
(2) By passing hydrogen sulphide into a solution of sulphur dioxide
(3) By dissolving sulphur in water
(4) By heating sulphur with iron
Which of the following is an example of a colloidal solution?
(1) Sugar solution
(2) Milk
(3) Sand in water
(4) Salt solution
Which of the following is an example of a solid sol?
(1) Coloured glass
(2) Fog
(3) Emulsion
(4) Foam
A colloidal system in which a liquid is dispersed in a solid is called a __________.
A colloidal system in which a solid is dispersed in a liquid is called a __________.
A colloidal system in which both the dispersed phase and dispersion medium are liquids is called an __________.
The minimum amount of an electrolyte required to cause coagulation of a sol is called its __________ value.
Colloidal particles are larger than molecules of a true solution but smaller than particles in a suspension. True or False?
State whether the following statement is true or false: Colloidal particles can pass through animal membranes but not through parchment paper.
State whether the following statement is true or false: Colloidal solutions are always transparent.
State whether the following statement is true or false: The Tyndall effect can be used to distinguish between a true solution and a colloidal solution.
