www.pue.kar.nic.in Chemistry Model Question Paper : Karnataka PU / Pre University

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Document Described : Chemistry Question Paper, Karnataka Question Paper

CHEMISTRY
Time : 3 Hours 15 Minutes ] [ Max. Marks : 90
Instructions : i) The question paper has four Parts.
ii) Parts A, B, C and D are common to all the candidates.
iii) Part A carries 10 marks. Each question carries one mark.
Part B carries 20 marks. Each question carries two marks.
Part C carries 40 marks. Each question carries five marks.
In Part D — D 1 carries 10 marks and D 2 carries
10 marks. Each question of D 2 carries five marks.
iv) Write balanced chemical equations and draw diagrams wherever necessary.

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PART – A :
Note : i) Answer all the ten questions.
ii) Questions have to be answered in one word or in one sentence each. Each question carries one mark. 10 × 1 = 10
1. At what temperature is neon adsorbed on charcoal in the separation of noble gases by Dewar's method ?
2. Give an example for polydentate ligands.
3. Name the chromium compound formed when potassium dichromate solution is treated with potassium hydroxide.
4. State Faraday's first law of electrolysis.
5. What is the co-ordination number of each ion, for a crystal that has radius ratio between 0·732 – 1·0 ?
6. What is electrophoresis ?
7. What is Pseudo first order reaction ?
8. Name the main product formed when bromoethane is heated with sodium metal in dry ether.
9. What is the reducing agent used in Clemmensen's reduction ?
10. Name an amino acid containing aromatic ring.

PART – B :
Note : i) Answer any ten questions.
ii) Each question carries two marks. 10 × 2 = 20
11. With the help of Ellingham diagram, explain why oxide of silver can be thermally decomposed at relatively lower temperature.
12. How does concentrated sulphuric acid react with potassium iodide ? Write the equation.
13. Explain ionisation isomerism with an example.
14. Write the energy level diagram for helium molecule and calculate the bond order in it.
15. Write any two factors deciding the order of a reaction.
16. What is gold number ? Give the gold number of starch.
17. A weak acid HA dissociates to an extent of 4·3% in a 10 – 3 M solution of it. Calculate its dissociation constant.
18. What is osmotic pressure ?
19. How is picric acid obtained from phenol ? Give the equation.
20. Write the Haworth's structure of ß-D ( + ) maltose.
21. Give any two postulates of Baeyer's strain theory.
22. What are triglycerides ? Write the general formula of a simple triglyceride.

PART – C :
I. Answer any two of the following questions : 2 × 5 = 10
23. a) How is potassium dichromate manufactured from concentrated chromite ore ? Give the equations. 4
b) Name the chemical used to remove the last traces of oxygen from a mixture of noble gases. 1
24. a) State Nernst distribution law. 2
b) On the basis of valence bond theory, explain the hybridisation in tetracarbonyl nickel ( O ). Indicate the geometry of it. 3
25. a) Many transition metals and their compounds are used as catalysts in several chemical reactions. Why ? 2
b) How does electron gas theory explain the malleability and ductility of metals ? 2
c) Write the highest oxidation state of Vanadium. 1

II. Answer any three of the following questions : 3 × 5 = 15
26. a) Explain Reimer–Tiemann reaction with an example. 3
b) Give any two differences between mesomeric and inductive effects. 2
27. a) Explain the mechanism of nitration of benzene. 3
b) What happens when bromoethane is heated with alcoholic potash ? Give the equation. 2
28. a) Write the equations for the following reactions :
i) a mixture of calcium acetate and calcium formate crystals are dry distilled at 400°C.
ii) Benzaldehyde is treated with concentrated sodium hydroxide solution. 2
b) What is the effect of electron releasing groups on the acidity of carboxylic acids ? Give reason. 2
c) Give any two uses of methanal. 1
29. a) How does nitrous acid react with aniline ? Give the equation. 2
b) What is a drying oil ? Mention one use of it. 2
c) Define the term 'isoelectric point'. 1

III. Answer any three of the following questions : 3 × 5 = 15
30. a) Explain the buffer action of a basic buffer containing ammonium hydroxide and ammonium chloride. 3
b) Define common ion effect with an example. 2
31. a) State Raoult's law of relative lowering of vapour pressure. Give the mathematical form of it. 2
b) Energy of activation of a first order reaction is 56·6 kJ/mol. If its rate constant at 298K is 2·4 × 10 – 3 /min, calculate the rate constant at 308K. ( R = 8·314 J/K/mol. ). 3
32. a) What is an electrochemical series ? Give one application of it. 2
b) Calculate the hydrogen ion concentration of a solution whose pH is 5·6. 2
c) Write the conjuate base of HCO – 1 3 . 1
33. a) What is standard free energy change of a chemical reaction ?
How is it related to the equilibrium constant ? 2
b) How is gold sol prepared by Bredig's electric arc method ? 2
c) Give an example for molecular crystals. 1
34. a) Give any two characteristics of an ideal solution. 2
b) Define solubility product. Write the relationship between solubility and solubility product of a sparingly soluble salt of the type A 2 B. 2
c) Under what condition, an exothermic reaction will be spontaneous, if ?S is negative ? 1

PART – D :
IV. Answer any one of the following : 1 × 10 = 10
35. a) Explain the construction and working of standard hydrogen electrode. Give one limitation of it. 4
b) Explain with equation, the role of limestone in the extraction of iron from haematite ore. 2
c) Define the following: 2
i) Chirality centre
ii) Geometrical isomerism.
d) Carbohydrate is a source of energy. Explain. 2

V. Answer any two of the following questions : 2 8 5 = 10
37. a) How is m-dinitrobenzene prepared in the laboratory from nitrobenzene ? 3
b) Explain Acrolein test. 2
38. Describe an experiment to show the effect of concentration on the rate of the reaction between potassium persulphate and potassium iodide. 5
39. For the estimation of potassium permanganate using standard oxalic acid solution —
i) write the chemical equation for the reaction involved.
ii) give the equivalent mass of potassium permanganate.
iii) name the indicator used.
iv) write the colour change at the end point.
v) write the equation for calculating the mass of potassium permanganate present in 250 cm 3 of the solution from its normality. 5

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