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Question 1: Rate of physisorption increases with (IIT JEE 2003)
(a) decrease in temperature
(b) increase in temperature
(c) decrease in pressure
(d) decrease in surface area
Answer: a
Solution: In physisorption, adsorbate is held on the surface of adsorbent by van der Waals forces only. The attraction between surface of adsorbent and the absorbate particles decreases with increase in temperature and vice versa.
Hence, the correct option is A.
Question 2: Among the following, the surfactant that will form micelles in aqueous solution at lowest molar concentration at ambient condition is- (IIT JEE 2008)
(a) CH3(CH2)15N(CH3)3Br
(b) CH3(CH2)11OSO3Na
(c) CH3(CH2)6COONa
(d) CH3(CH2)11N(CH3)3Br
Answer: a
Solution: Critical concentration for micelle formation decreases as the molecular weight of hydrocarbon chain of surfactant grows because in this case true solubility diminishes and the tendency of surfactant molecules to associate increases.
Hence, the correct option is A.
Question 3: Which of the following electrolytes is most effective coagulating agent for Sb2S3? (IIT JEE 2009S)
(a) Na2SO4
(b) CaCl2
(c) Al2(SO4)3
(d) NH4Cl
Answer: c
Solution: As Sb2S3 is a negative sol, so will be the most effective coagulating agent due to higher positive charge at Al (Al3+).
Hence, the correct option is C.
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FAQs on Solved Examples: Surface Chemistry - Mock Tests for JEE Main and Advanced 2025
| 1. What is surface chemistry? |  |
| 2. What are adsorption and absorption? | |
Ans. Adsorption is the process in which molecules or atoms from a gas or liquid adhere to the surface of a solid. It occurs due to the attractive forces between the adsorbate (gas or liquid) and the adsorbent (solid surface). On the other hand, absorption is the process in which a substance is dissolved or incorporated into another substance. It involves the penetration of a substance into the bulk of another substance.
| 3. How does surface area affect adsorption? | |
Ans. Surface area plays a crucial role in adsorption. The greater the surface area of a solid, the more adsorption can occur because there are more sites available for the adsorbate to interact with. An increase in surface area leads to an increase in the number of active sites, resulting in higher adsorption capacity.
| 4. What is catalysis in surface chemistry? | |
Ans. Catalysis in surface chemistry refers to the process in which a substance called a catalyst alters the rate of a chemical reaction by providing an alternative reaction pathway with lower activation energy. In surface catalysis, the reactants adsorb onto the surface of the catalyst, allowing the reaction to proceed more easily. Catalysts are not consumed in the reaction and can be used repeatedly.
| 5. How does surface chemistry impact various industries? | |
Ans. Surface chemistry plays a vital role in various industries. For example, in the pharmaceutical industry, surface chemistry helps improve drug delivery systems by designing nanoparticles with specific surface properties. In the energy sector, it is used in catalytic converters to reduce harmful emissions from vehicles. In the field of materials science, surface chemistry is utilized to enhance the performance and durability of coatings, paints, and adhesives. Overall, surface chemistry has widespread applications in industries ranging from electronics to food processing.
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