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All Chapter 3 Marks

12th Standard EM

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Chemistry

Time : 03:00:00 Hrs
Total Marks : 180
    Answer The Following Question:
    60 x 3 = 180
  1. Give the uses of zinc.

  2. Explain the following terms with suitable examples.
    (i) Gangue
    (ii) slag

  3. What is meant by aluminotherrnitc process?

  4. Support the statement given below with relevant examples

  5. Give one example for each of the following
    (i) icosogens
    (ii) tetragen
    (iii) prictogen
    (iv) chalcogen

  6. Write a note on metallic nature of p-block elements

  7. What are the uses of diborane?

  8. Describe the structure of carbon nanotubes.

  9. How will you prepare chlorine in the laboratory?

  10. Write the reason for the anamolous behaviour of Nitrogen.

  11. Name a reaction for the estimation of Ozone.

  12. Why do noble gases form compounds with fluorine and oxygen only?

  13. Write the electronic configuration of Ce4+ and Co2+.

  14. Explain why Cr2+ is strongly reducing while Mn3+ is strongly oxidizing.

  15. Give the ionic reaction of electrolytic of aqueous solution of KMnO4

  16. Why Hcl and HNO3 cannot be used for making the KMnO4 medium acidic?

  17. Write briefly about the applications of coordination compounds in volumetric analysis

  18. Why tetrahedral complexes do not exhibit geometrical isomerism

  19. What is the significance of stability constants?

  20. Mohr's salt answers the presence of Fe2+, NH4+and SO42- ions, whereas the potassium ferrithiocyanate will not answer Fe3+ and SCN ions give reason.

  21. Explain Schottky defect.

  22. Calculate the number of atoms in a fcc unit cell

  23. Silver crystallines in fcc lattice. If edge length of the cell is 4.07 x 10-8 em and density is 10.5 g cm-3. Calculate the atomic mass of silver

  24. If NaCI is doped with 10-3 mol % of SrCl2 What is the concentration of cation valencies?

  25. A gas phase reaction has energy of activation 200 kJ mol-1. If the frequency factor of the reaction is is 1.6 X1013s-1 Calculate the rate constant at 600 K.(e-40.09=3.8X10-48)

  26. A reaction is of second order in A and first order in B.
    (i) Write the differential rate equation. 
    (ii) How is the rate affected on increasing the concentration of A three times?
    (iii) How is the rate affected when the concentration of both A and B is doubled?

  27. Give examples for first order reaction.

  28. (i) A first order reaction takes 8 hours for 90% completion. Calculate the time required for 80% completion. (log 5 = 0.6989 ; log10 = 1)

  29. Define pH.

  30. Calculate the pH of 1.5\(\times\)10-3Msolution of Ba(OH)2

  31. What do you mean by auto ionisation of water?

  32. Define buffer Index

  33. Why is AC current used instead of DC in measuring the electrolytic conductance?

  34. Is it possible to store copper sulphate in an iron vessel for a long time?
    Given : \(E^{0}_{Cu^{2+}|Cu} = 0.34\) V and \(E^{0}_{Fe^{2+}|Fe} = -0.44\)V.

  35. Write the cell representation of the galvanic cell in which the following reaction take place
    \({ Zn }_{ (s) }+Cu{ SO }_{ 4 }\rightarrow { ZnSO }_{ 4 }+{ Cu }_{ (s) }\)
    For the above cell. Identify the anode and cathode half cell.

  36. Why does the emf of Leclanche cell decrease?

  37. Why are lyophillic colloidal sols are more stable than lyophobilc colloidal sol.

  38. Addition of Alum purifies water. Why?

  39. Why does physisorption decrease with increase of temperature?

  40. Explain the meaning of the statement. 'Adsorption is a surface phenomenon'.

  41. What happens when 1-penyl ethanol is treated with acidified KMnO4.

  42. Complete the following sequence of reaction and Identify A, Band C.

  43. How will you prepare phenol (i) From chloro benzene (ii) From benzene sulphonic acid?

  44. When tertiary butyl alcohol and 1-butanol are separately treated with a few drops of KMnO4, in one case only the purple colour disappears and a brown precipitate is formed. Which of the two alcohols gives the above reaction and what is that brown precipitate?

  45. An alkene (A) on ozonolysis gives propanone and aldehyde (B). When (B) is oxidised (C) is obtained. (C) is treated with BriP gives (D) which on hydrolysis gives (E). When propanone is treated with HCN followed by hydrolysis gives (E). Identify A) B) C) D and E.

  46. A carbonyl compound A having molecular formula C5H10O forms crystalline precipitate with sodium bisulphate and gives positive iodoform test. A does not reduce Fehling solution. XII Identify A.

  47. Explain Stephen's reaction.

  48. How is carboxylic acid prepared from alcohols?

  49. Arrange the following
    i. In increasing order of solubility in water, C6H5 NH2,(C2H5)2 NH,C2H5NH2
    ii. In increasing order of basic strength
    a) aniline, p- toludine and p – nitroaniline
    b) C6H5 NH2,C6H5 NHCH3,C6H5NH2 ,p-Cl-C6- H4-NH2
    iii. In decreasing order of basic strength in gas phase
    (C2H5)NH2 ,(C2H5)NH, (C2H5)5N and NH3
    iv. In increasing order of boiling point
    C6H5OH, (CH3)2NH, C2H5NH2
    v. In decreasing order of the pKb values
    C2H5NH2, C6H5NHCH3.(C2H5) NH and CH3NH2
    vi. Increasing order of basic strength
    C2H5NH2,C6H5NH(CH3)2 ,(C2H5)2 NH and CH3NH2
    vii. In decreasing order of basic strength

  50. How will you prepare propan – 1- amine from
    i) butane nitrile
    ii) propanamide
    ii) 1- nitropropane

  51. An Organic compound (A) with molecular formula C6H7N gives (B) with HNO2 / HCI at 273 K. The aqueous solution of (B) on heating gives compound (C) which gives violet colour with netural FeCI3. Identify the compounds (A), (B) and (C) and write the equations.

  52. How are the following compounds obtained from benzene diazonium chloride?
    (i) phenol
    (ii) ester
    (iii) p-hydroxy azo benzene

  53. What are reducing and non – reducing sugars?

  54. Why carbohydrates are generally optically active.

  55. Give the structure of α - D - glucose and β- D - glucose

  56. Distinguish between fat soluble and water soluble vitamins.

  57. What are drugs? How are they classified

  58. Write the structural formula of aspirin.

  59. How is Low density polyethene prepared?

  60. The monomer is capro lactam   Identify the polymer when the monomer is heated at 533K.

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