Page 1 : GOVERNMENT OF KARNATAKA, , KARNATAKA STATE PRE-UNIVERSITY EDUCATION EXAMINATION BOARD, Il YEAR PUC MODEL QUESTION PAPER (for -2021-22 academic year only), SUBJECT CODE: 34 SUBJECT: CHEMISTRY, ENGLISH VERSION, INSTRUCTIONS:, 1. The question paper has four parts. All parts are compulsory., 2. a. Part-A carries 10 marks. Each question carries | mark., b. Part-B carries 10 marks. Each question carries 2 marks., c. Part-C carries 15 marks. Each question carries 3 marks., d. Part-D carries 35 marks. Each question carries 5 marks., , 3. Write balance chemical equations and draw diagrams wherever necessary., 4. Use log tables and simple calculator if necessary (use of scientific calculator is not allowed)., PART-A, , I. ANSWER ANY TEN OF THE FOLLOWING. EACH QUESTION CARRIES 1 MARK. 10X1=10, 1, What are F-centres?, 2. How does the enthalpy change on mixing two volatile liquids to form an ideal solution?, 3. Give an example for natural semipermeable membrane., 4. What happens to molar conductivity when one mole of potassium chloride dissolved in one litre is diluted, to five litres?, . Write the energy distribution curve showing temperature dependence of rate of a reaction., Name the shape selective catalyst which converts alcohols directly into gasoline in petroleum industry., What are co-enzymes?, , en ay, , Name the method used for concentration of sulphide ores., . Complete the reaction: XeFs + 2H2.0 > ?+4HF, , 2, , 10. Which element of 3d series has more number of unpaired electrons in the ground state?, , 11. Define the term racemisation., , 12. Out of ortho & para nitrophenols, which one less volatile compound?, , 13. Mention the role of dry HCI in the addition of alcohols to carbonyl compounds., , 14. Give an example for synthetic biodegradable polyamide copolymer., , 15. Name the first popular artificial sweetening agent., , PART-B, II. ANSWER ANY FIVE OF THE FOLLOWING. EACH QUESTION CARRIES 2 MARKS. 5X2=10, , 16. Calculate the number of particles present per unit cell ina BCC unit cell., , 17. State Henry’s law. Write its mathematical form., , 18. Calculate the limiting molar conductivity of calcium chloride (CaCl). Given that the limiting molar, , conductivities of Ca?* and CI ions are 119.0Scm?mol"! and 76.3Scm?mo!' respectively., , 19. Write the symbolic representation of standard hydrogen electrode. Mention its standard electrode, potential value (EB)., , 20. What is the role of coke and lime stone during the extraction of cast iron using blast furnace., , 21. Name the noble gas which does not have general noble gas electronic configuration ns*np°. Name the, commercial source of this noble gas., , 22. Explain Friedel-Crafts reaction with equation by taking chlorobenzene as example., , 23. How do you prepare propanamine by Hoffmann’s bromamide degradation reaction? Write the chemical, equation., 24. Why soap does not work in hard water?, 25. Give an example each for. a. Anti-fertility drug _b. Anionic detergents, PART-C