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12th Standard English Medium Chemistry Reduced Syllabus Creative Five mark Question with Answer key - 2021(Public Exam )

12th Standard

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 125

    Part A

    25 x 5 = 125
  1. Explain refining of nickel by mond's process

  2. What are the various methods by which carbon-di-oxide is prepared?

  3. Give a detailed account on allotropes of sulphur.

  4. Explain the Deacon's process

  5. Complete the following reactions
    (i) Cr2O72-
    (ii) Cr2O7- + 6I-+ 14H+ ⟶
    (iii)  Cr2O7- + 3S2-+ 14H+ ⟶
    (iv) Cr2O7- + 3SO2+ 14H+
    (v) Cr2O7- +3Sn2+ + 14H+ ⟶
    (vi) K2Cr2O7 + 8H2SO4 + 3CH3CH2OH ⟶
    (vii) 2MnO4- + 5(COO)2- + 6H+ ⟶
    (viii) 2MnO4- + 10I+ 16H+
    (ix) 2MnO4- + 5S2-+ 16H+ ⟶
    (x) 2MnO4- + 5NO2- + 6H+ ⟶
    (xi) 2KMnO4 + 3H2SO4 + 5CH3CH2OH ⟶
    (xii) 2MnO4- + 5SO32- + 6H+

  6. How are metal carbonyls classified based on the structure?

  7. How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.

  8. For the reaction R - P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and second.

  9. The half life period of first order reactions is 10 mins. What percentage of the reactant will remain after one hour?

  10. Calculate the pH of 0.001 MHCI solution.

  11. To 1M solution of AgNO3, 0.75 F quantity of current is passed. What is the concentration of the electrolyte, AgNO3 remaining in the solution?

  12. If E1 = 0.5 V corresponds to Cr3++ 3e- ➝ Cr(s) and E= 0.41V corresponds to Cr3++ e- ➝ Cr2+ reactions, calculate the emf (E3) of the reaction Cr2++ 2 e- ➝ Cr(s)

  13. Explain SHE as a reference electrode.

  14. Write a note on Freundlich adsorption isotherm.

  15. An organic compound A of molecular formula C3H6O on reduction with LiAlH4 gives B. Compound B gives blue colour in Victor Meyer's test and also forms a chloride C with SOCl2. The chloride on treatment with alcoholic KOH gives D. Identify A) B)C and D and explain the reactions

  16. An organic compound A (C2H6O2) liberates hydrogen with metallic sodium. Compound A when heated with anhydrous zinc chloride ultimately gives B (C2H4O) whereas) when heated with cone. phosphoric acid gives C (C4H10O3). A on oxidation with acidified K2Cr2O7gives compound D (CH2O2). Identify A) B)C and D. Explain the reactions involved.

  17. What are ethers? Write note on simple and mixed ethers with examples.

  18. An organic compound (A) C6H6O gives violet colour with neutral FeCl3 solution. With NH3 in the presence of anhydrous ZnCI2, (A) gives (B) (C6H7N). (A) with dimethyl sulphate gives (C) (C7H8O). What are (A), (B) and (C)? Explain the reactions.

  19. Explain the mechanism of Cannizaro reaction.

  20. How do you distinguish formic acid from acetic acid?

  21. An aromatic compound (A) with molecular formula C7H6O has the smell of bitter almonds. (A) reacts with Cl2 in the absence of catalyst to give (B) and in the presence of catalyst compound (A) reacts with chlorine to give (C). Identify (A), (B) and (C). Explain the reactions.

  22. An organic compound (A) of molecular formula C7H6O is called as oil of bitter almonds. (A) on oxidation gives (B) of molecular formula C7H6O2 which gives brisk effervescence with NaHCO3 solution. When (A) is refluxed with aqueous alcoholic (KCN) compound (C) is formed. Identify A) Band C and write the equations.

  23. What happens when ethylamine is treated with
    (i) CHCl3/NaOH
    (ii) CS2
    (iii) C6H5CHO.

  24. Explain the classification of hormones.

  25. Explain the classification of polymers based on their structure and mode of synthesis.

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