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Revision set -02, 1. What do you understand by molecularity of a, reaction?, 2. What do you understand by physical and chemical, adsorption?, 3. What is Tyndall effect? Discuss., 4. Physisorption decreases on increasing temperature., Why ?, 5. What do you mean by order of reaction ?, 6. What is gold number?, 7. What do you mean by the rate constant of a chemical, reaction?, 8. What are layophobic and layophilic colloids? Explain, with one example of each., 10. Why cryolite is used in the extraction of aluminium, metal?, 11. describe the principle of froth floatation ?, 12. Write the name and chemical composition of one, important ore of each of Aluminium and copper., 13. Name two important ores of Iron. How is it extracted, from its chief ore? Give reactions., or, (A) Discuss the principle of extraction of Zinc metal from, Zinc blende ore., (B) How does Zn react with H2SO4 ?

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14. A first order reaction takes 20 minutes for 25%, decomposition. Calculate the time when 75% of the, reaction will be completed. (Given:- log2=0.3010,, log3=0.4771, log4=0.6021.), Or, What is first order reaction? Give two examples of first, order reaction. Obtain an experssion for the rate, constant of a first order reaction?, 15. (A) Write the difference between Adsorption and, Absorption.?, (B) Define Shape selective catalysis.