Chemistry in Style of Deepak Sir
------------------------------------------------------------------------------------------------------------------------------
Surface Chemistry
Very Short Answer Questions (1 mark)
Q1. Give reason why a finely divided substance is more effective as an adsorbent.
Q2. Give mathematical expression foe Freundlich adsorption isotherm.
Q3. What is meant by shape-selective catalysis of reaction ?
Q4. Does colloidal refer to a particular substance or the state of a substance ?
Q5. What is collodion ?
Q6. What are dispersed phase and dispersion medium of gels ?
Q7. Explain why hydrophilic sols are relatively more stable than hydrophobic sols?
Q8. Which aerosol depletes ozone layer ?
Q9. What is especially observed when a beam of light is passed through a colloidal solution ?
Q10. What causes Brownian movement in colloidal particles ?
Q11. What is meant by coagulation value ?
Short Answer Questions (2,3 mark)
Q12. Write four distinguishing features operative between chemisorption and physisorption.
Q13. How does the phenomenon of adsorption find application in each of two following
processes ?
(a) Gas masks
(b) Heterogeneous catalysis
(c) In curing disease
Q14. What is heterogeneous catalysis ? Explain modern adsorption theory of heterogeneous
catalysis .
Q15. How are the following colloids different from each other in respect of dispersion medium
and dispersed phase ? Give one example of each type.
(a) An aerosol
(b) A hydrosol
(c) An emulsion
Q16. Write the dispersed phase and dispersion medium of the following colloids :
(a) Cheese
(b) Fog
Q17. What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated
on the addition of small amounts of electrolytes ?
Q18. Define the following terms giving an example of each :
(a) Associated colloids (b) Lyophilic sol
(c) Adsorption
Q19. Explain the following term giving a suitable example for each :
(a) Aerosol
(b) Emulsion
(c) Micelle
Q20. Define the following terms with an example in each case :
(a) Macromolecular sol (b) Peptization
(c) Emulsion
Deepak Coaching Center
www.deepakclass.com | Call : 8182008181
Chemistry in Style of Deepak Sir
------------------------------------------------------------------------------------------------------------------------------
Q21. Account for the following :
(a) When a beam of light is passed through a colloidal solution, the path of the beam gets
illuminated.
(b) A freshly formed precipitate of ferric hydroxide can be converted to colloidal sol by
shaking it with a small quantity of ferric chloride.
(c) Direct current is passed through a colloidal solution.
Q22. Describe a conspicuous change observed when :
(a) a solution of NaCl is added to a sol of hydrated ferric oxide.
(b) a beam of light is passed through a solution of NaCl and then through a sol.
Q23. Explain the following terms :
(a) Phase of a colloidal solution (b) Electro dialysis
(c) Electro kinetic potential
Q24. Explain each of the following terms :
(a) CMC
(b) Kraft’s temperature
(c) Electrophoresis
Q25. Differentiate between the following :
(a) Lyophilic sol and lyophobic sol
(b) Peptization and coagulation
Q26.(a) What are micelles ? How do they differ from ordinary colloidal particles ? Give two
examples of micelle forming substances.
(b) State Hardy-Schulze rule.
Q27. What is the difference between oil/water (O/W) type and water/oil (W/O) type emulsions?
Give an example of each type.
Q28. Explain the following terms :
(a) Activity of a catalyst (b) Selectivity of a catalyst
(c) Emulsifying agents
Deepak Coaching Center
www.deepakclass.com | Call : 8182008181