Which of the following statements about colloids is False?
- Freezing point of colloidal solution is lower than true solution at same concentration of a solute.
- Colloidal particles can pass through ordinary filter paper.
- When silver nitrate solution is added to potassium iodide solution, a negatively charged colloidal solution is formed.
- When excess of electrolyte is added to colloidal solution, colloidal particle will be precipitated.
The Correct Option is A
Solution and Explanation
Freezing point is a colligative property. The colligative properties are properties that depend only on the number of solute particles in a solution, but are independent of the nature of those particles. Therefore, freezing point of colloidal solution will be same as that of true solution at same concentration of a solute.
So, the correct option is (A): Freezing point of colloidal solution is lower than true solution at same concentration of a solute.
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Concepts Used:
Surface Chemistry
The study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc.
Read Also: Surface Chemistry
Applications of surface chemistry are:
Adsorption:
The process of attraction and aggregation of the molecules of a substance on the surface of a solid is known as adsorption. For Example, N2 adsorbs on the surface of activated charcoal
Two types of adsorption are:-
- Chemisorption: It is also known as Chemical Adsorption.
- Physisorption: It is also known as Physical Adsorption.
Corrosion:
The process through which the refined metals convert themselves into more stable compounds is known as corrosion.
Crystallisation:
The type of technique used in order to purify the substances to separate Solids from liquids is known as crystallisation.
Heterogeneous Catalysis:
The process wherein a catalyst is used in order to increase the rate of a chemical reaction is known as catalysis. The catalyst does not undergo any transformation and can be recovered in a chemically unchanged state.
There are two types of catalysis:-
- When the catalyst involved and the reacting substances are same states of matter or in the same phase, it is known as Homogeneous Catalysis.
- When the catalyst involved and the reacting substances are in different states of matter or different phases, it is known as Heterogeneous Catalysis.