Among the following, correct statement is :
- Brownian movement is more pronounced for smaller particles than for bigger-particles.
- Sols of metal sulphides are lyophilic.
- Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.
- One would expect charcoal to adsorb chlorine more than hydrogen sulphide.
The Correct Option is A
Solution and Explanation
Thus, option A is correct.
Lyophobic sols- The colloidal system in which the particles of the dispersed phase have no or very little interactions with the dispersion medium are called lyophobic sols. For example $Fe(OH)_3$ and metal sulphides like $As_2S_3$ .
Thus, option B is incorrect.
Hardy-Schulze law states that higher the charge of the coagulating ions, greater its coagulating power, having opposite sign of solution. This law takes into consideration only the charge carried by an ion, not its size.
Thus, option C is incorrect.
Easily liquefiable gases are readily adsorbed than gases which do not liquefy easily. Easily liquefiable gases have higher critical temperature and stronger Vander Waals forces of attraction.
Thus, option D is incorrect.
Top Questions on Surface Chemistry
In the given TLC, the distance of spot \( A \) and \( B \) are 5 cm and 7 cm, from the bottom of the TLC plate, respectively. The \( R_f \) value of \( B \) is \( x \times 10^{-1} \) times more than \( A \). The value of \( x \) is _________ .- JEE Main - 2024
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- Gold sol is not a:
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- Identify the incorrect statement:
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- The adsorbent used in adsorption chromatography is/are
A. silica gel
B. alumina
C. quick lime
D. magnesia
Choose the most appropriate answer from the options given below :- JEE Main - 2024
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Questions Asked in JEE Main exam
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All the letters of the word "GTWENTY" are written in all possible ways with or without meaning, and these words are arranged as in a dictionary. The serial number of the word "GTWENTY" is:
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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.