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12th Chemistry Practice paper-01

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CHEMISTRY Class II PreUni Plus 2016-2017 Practice Paper - 01 Max. Marks Duration Date 70 3 hours 15 minutes 25-01-2017 Instructions 1. The questions paper has four parts: A, B, C and D. All parts are compulsory. 2. Write balanced chemical equations and draw labeled diagrams wherever required. 3. Use log tables and the simple calculator if necessary (Use of scientific calculators is not allowed). PART - A I. Answer the following questions (one mark each) [10 1 = 10] 1. What is the value of van t Hoff factor for a dilute solution of K2SO4 in water? (Assume complete ionization) 2. Mention the type of solution formed by ornamental gold. 3. When zinc is dipped in H2SO4, H2 is evolved but when Ag is dipped H2 is not evolved. Why? 4. Given : A B C , follows zero order kinetics. Write the rate equation (Given : order with respect to A is 1) 5. Between physisorption and chemisorption, which one has higher enthalpy of adsorption? 6. Name the refining process used for the purification of silicon. 7. Noble gases have very low boiling points. Why? 8. Write the IUPAC name of H CH3 H H H Br 9. Mention the hybridized state of carbonyl carbon atom. 10. Which vitamin deficiency causes pernicious anaemia? PART - B II. Answer any FIVE of the following questions (two marks each) [5 2 = 10] 11. Calculate the number of particles (atoms) per unit cell in a BCC crystal lattice. 12. Write the anodic and cathodic reactions in a lead acid battery, when it is discharged. 13. Show that for a first order reaction, time required for completion of 99.9% is 10 times the half life of the reaction. 14. What is Lanthanoid contraction? Write its consequences. 15. Complete the following reactions: Cu (i) R CH 2 OH 573K H (ii) CH 3 CH CH 2 H 2 O 16. Explain Clemmensen reduction with an example. 2P1617CPP1 1

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