CBSE Class 12 Chemistry Surface Chemistry. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
ONE MARK QUESTIONS
1. What is the basic difference between adsorption and absorption?(2010)
2. Why are finely divided substances more effective as an adsorbent? (2011)
3. Why is the adsorption phenomenon always exothermic? (2012)
4. What is meant by shape selective catalysis?
5. Out of AlCl3 and NaCl, which is more effective in causing coagulation of a negative sol and why? (2015)
TWO MARK QUESTIONS
1. What is the difference between a colloidal solution and emulsion? What is the role of emulsifier in forming emulsion? (2010)
2. What are the characteristics of a solid catalyst?
3. What is activation of an adsorbent? How can it be achieved?
THREE MARK QUESTIONS
1.Differentiate between giving examples.
a) Homogeneous and heterogeneous catalysis
b) Physical and chemical adsorption
c) Lyophobic and lyophilic colloids
2. What is the difference between multimolecular and macromolecular colloids? Give one example of each type. How associated colloids are different from these two types of colloids. (2010)
3. Explain how the phenomenon of adsorption finds application in each of the following processes:
a) Production of vacuum
b) Heterogeneous catalysis
c) Froth floatation process
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