Welcome to www.pgtchemistry.com ! In this post, we are offering a mock test on Surface Chemistry, a crucial topic for the PGT Chemistry exam. This test will help you assess your knowledge and strengthen your preparation.
Syllabus for Surface Chemistry – PGT Chemistry Exam-
Surface Chemistry is an important topic in the PGT Chemistry exam, covering key concepts related to adsorption, catalysis, and colloidal systems. Below is the detailed syllabus for Surface Chemistry for the PGT Chemistry exam.
1. Adsorption:
- Introduction to Adsorption: Definition and types of adsorption (physisorption and chemisorption)
- Factors affecting adsorption: Temperature, pressure, surface area of the adsorbent, nature of adsorbate
- Freundlich and Langmuir Adsorption Isotherms: Theories and mathematical expressions, graphical representation
- Applications of Adsorption: Adsorption in catalysis, pollution control, removal of coloring matter, gas masks, and chromatography
2. Catalysis:
- Types of Catalysis: Homogeneous and heterogeneous catalysis
- Mechanism of Catalysis: Intermediate compound theory, adsorption theory of heterogeneous catalysis
- Enzyme Catalysis: Characteristics of enzyme catalysis, mechanism, and factors affecting enzyme activity (temperature, pH, substrate concentration)
- Promoters and Poisons in Catalysis: Role and effects in catalytic activity
- Industrial Applications of Catalysis: Haber process, Contact process, catalytic converters, and petroleum refining
3. Colloidal State:
- Definition and Classification of Colloids: Lyophilic and lyophobic colloids, multimolecular, macromolecular, and associated colloids
- Preparation of Colloidal Solutions: Condensation and dispersion methods (Bredig’s arc method, peptization, chemical methods)
- Purification of Colloids: Dialysis, ultrafiltration, and electrodialysis
- Properties of Colloids: Tyndall effect, Brownian movement, electrophoresis, electro-osmosis
- Coagulation of Colloids: Hardy-Schulze rule, coagulation by electrolytes, and protective colloids
- Emulsions and Gels: Types of emulsions, methods of preparation, properties, and uses.
4. Applications of Surface Chemistry:
- Adsorption in Environmental Cleanup: Use in water purification, air filtration, and removal of pollutants
- Colloids in Daily Life: Applications in food products, medicines (antibiotics), paints, and cosmetics
- Catalysis in Industry: Role in chemical production, fuel cells, and energy-efficient processes.
5. Miscellaneous Topics:
- Gold Number: Definition and its importance in colloidal stability
- Critical Micelle Concentration (CMC): Role in the formation of micelles and detergents
- Interfacial Phenomena: Surface tension, surfactants, and wetting agents
Mock Test: Surface Chemistry (30 Questions)
Instructions:
- Each question carries 1 mark.
- No negative marking for incorrect answers.
- Answer key is provided at the end of the test.
Q1. Adsorption is the process where a substance:
- (a) Diffuses into the bulk of another substance
- (b) Accumulates on the surface of another substance
- (c) Forms a solid solution
- (d) Remains unaffected
Q2. Which of the following is an example of physisorption?
- (a) Hydrogen on finely divided nickel
- (b) Oxygen on metal surface
- (c) Nitrogen on silica gel
- (d) Ammonia on activated charcoal
Q3. Chemisorption:
- (a) Is irreversible
- (b) Increases with increase in temperature
- (c) Is highly specific in nature
- (d) All of the above
Q4. The extent of adsorption of gas on a solid surface increases with:
- (a) Increase in temperature
- (b) Increase in surface area of the adsorbent
- (c) Increase in the size of the gas molecule
- (d) Decrease in pressure
Q5. The adsorption of gases on a solid is generally:
- (a) Endothermic process
- (b) Exothermic process
- (c) Neither exothermic nor endothermic
- (d) Constant for all gases
Q6. Freundlich adsorption isotherm is valid for:
- (a) Multilayer adsorption
- (b) Monolayer adsorption
- (c) Both monolayer and multilayer adsorption
- (d) Chemical adsorption
Q7. Which of the following is an example of a lyophilic colloid?
- (a) Gum
- (b) Gold sol
- (c) Ferric hydroxide sol
- (d) Sulfur sol
Q8. Which of the following methods is used to protect a colloid?
- (a) Electrophoresis
- (b) Addition of electrolytes
- (c) Peptization
- (d) Addition of a lyophilic colloid
Q9. The phenomenon of coagulation of colloidal particles by the addition of an electrolyte is termed as:
- (a) Peptization
- (b) Dialysis
- (c) Electrophoresis
- (d) Flocculation
Q10. Gold number is:
- (a) The minimum amount of an electrolyte required to coagulate a colloid
- (b) The minimum amount of a protective colloid required to prevent the coagulation of gold sol
- (c) The temperature at which a colloid coagulates
- (d) The concentration of dispersed phase in a colloid
Q11. Which of the following is a characteristic of lyophobic colloids?
- (a) Easily coagulated
- (b) Thermodynamically stable
- (c) Strong interaction between particles
- (d) Irreversible formation
Q12. Tyndall effect is observed in:
- (a) True solution
- (b) Colloidal solution
- (c) Electrolyte
- (d) Suspension
Q13. The process of removing electrolytes from a colloidal solution by dialysis is:
- (a) Peptization
- (b) Coagulation
- (c) Purification
- (d) Tyndall effect
Q14. Which of the following statements is correct for Brownian movement in colloidal particles?
- (a) It decreases with increase in particle size
- (b) It increases with increase in temperature
- (c) It is independent of the size of particles
- (d) Both (a) and (b)
Q15. The electrokinetic potential in colloidal solutions is called:
- (a) Zeta potential
- (b) Dipole moment
- (c) Electrode potential
- (d) Polarizability
Q16. Which of the following colloids is used in medicine for detoxification?
- (a) Silver sol
- (b) Gold sol
- (c) Starch sol
- (d) Sulfur sol
Q17. Critical micelle concentration (CMC) is associated with:
- (a) Formation of emulsions
- (b) Micelle formation in surfactants
- (c) Gel formation
- (d) None of the above
Q18. Colloidal particles can be removed from a solution by:
- (a) Tyndall effect
- (b) Ultrafiltration
- (c) Electrophoresis
- (d) Precipitation
Q19. In lyophilic colloids, the colloidal particles are:
- (a) Solvent-repelling
- (b) Solvent-attracting
- (c) Electrolyte-repelling
- (d) Electrolyte-attracting
Q20. The term “emulsion” is used for:
- (a) Solid in liquid colloid
- (b) Liquid in liquid colloid
- (c) Gas in liquid colloid
- (d) Gas in solid colloid
Q21. A catalyst increases the rate of reaction by:
- (a) Increasing the activation energy
- (b) Decreasing the activation energy
- (c) Increasing the enthalpy change
- (d) None of the above
Q22. Which of the following is an example of heterogeneous catalysis?
- (a) Iron in the Haber process
- (b) Sulfuric acid in esterification
- (c) Pt in the contact process
- (d) Both (a) and (c)
Q23. Colloidal solution of gold is:
- (a) Red
- (b) Blue
- (c) Yellow
- (d) Violet
Q24. Which of the following processes leads to the formation of colloids?
- (a) Peptization
- (b) Condensation
- (c) Bredig’s arc method
- (d) All of the above
Q25. In the Freundlich isotherm equation, the value of n:
- (a) Is always less than 1
- (b) Is always greater than 1
- (c) Lies between 1 and 10
- (d) Is always greater than 10
Q26. Which of the following is a method to increase the stability of colloids?
- (a) Addition of electrolytes
- (b) Increasing particle size
- (c) Decreasing particle size
- (d) Addition of protective colloids
Q27. Langmuir adsorption isotherm is valid for:
- (a) Multilayer adsorption
- (b) Monolayer adsorption
- (c) Both monolayer and multilayer adsorption
- (d) Chemisorption only
Q28. The Hardy-Schulze rule refers to:
- (a) The coagulation of colloids
- (b) The preparation of colloids
- (c) The stability of colloids
- (d) The purification of colloids
Q29. Which of the following can be used to separate colloidal particles from a mixture?
- (a) Centrifugation
- (b) Filtration
- (c) Dialysis
- (d) Sedimentation
Q30. The property of self-dispersion shown by lyophilic colloids is called:
- (a) Coagulation
- (b) Peptization
- (c) Spontaneous dispersion
- (d) Brownian motion
Answer Key:-
- 1 (b), 2(c), 3(d), 4(b), 5 (b), 6(c), 7(a), 8(d), 9(d), 10(b), 11(a), 12(b), 13(c), 14(d), 15(a), 16(a), 17(b), 18(b), 19(b), 20(b), 21(b), 22(d), 23(a), 24(d), 25(c), 26(d), 27(b), 28(a), 29(c), 30(c)
Notes Of Surface chemistry
If you want to read and download notes of surface chemistry, then you can click on below button
Conclusion:
This set of 30 questions will help you test your understanding of key concepts in Surface Chemistry for the PGT Chemistry exam. Keep practicing and revising with us at www.pgtchemistry.com to strengthen your preparation.
