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Sample 5 Mark Creative Questions (New Syllabus) 2020

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 145

    Part A

    29 x 5 = 145
  1. In the extraction of copper, explain the smelting process.

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

  3. Why is dioxygen a gas but sulphur a solid?

  4. Explain the oxidising and reducing property of SO2·

  5. An element 'A' occupies group number 15 and period number 3. It reacts with chlorine: to giveBwhich further reacts with chlorine to giveCat 273K. Both Band Care chlorinating agents for organic compounds. C is a better chlorinating agent because it chlorinates metals also.Breacts with SO3and reduces it to SO2' B has a pyramidal shape. C has
    trigonal bipyramidal shape by sp3d hybridisation. Identify the element A and the compounds B ' and C. Write the reactions.

  6. Write a short note on the oxidation states of 3d series elements.

  7. What are the postulates of valance bond theory? Give its limitations.

  8. What are the salient feature of crystal field theory?

  9. A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body - centre. What is the formula of the compound? What is the coordination numbers of P and Q?

  10. How are crystals classified?

  11. The conversion of molecules x to y follows second order kinetics. Its concentration of x is increased to three times how will it affect the rate of formation of y?
    For the reaction x ➝ y as it follows second order kinetics wherefore the rate of formation of y?

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

  13. Calculate the pH of 0.1 M CH3COOH solution. Dissociation constant of acetic acid is 1.8 x 10-5M.

  14. The ionisation constant of 0.2 M formic acid is 1.8 x 10-4. Calculate its percentage ionisation.

  15. A 0.02 M solution of a weak mono basic acid is 5% ionised. Calculate the ionisation constant of the acid.

  16. Explain buffer action in an acidic buffer.

  17. The electrochemical equivalent of an electrolyte is 2.35 gm amp-1 sec-1. Calculate I the amount of the substance deposited when 5 ampere is passed for 10 sec.

  18. The emf of the half cell Cu2+(aq)/ Cu(s). containing 0.01 M Cu2+solution is + 0.301V Calculate the standard emf of the half cell

  19. How will you calculate solubility product of AgCI which is a sparingly soluble salt?

  20. Write the characteristics of catalysts.

  21. An organic compound A of molecular f formula C6H6O gives violet colouration with neutral FeCI3• Compound A on treatment with metallic Na gives compound B. Compound B on treatment with CO2 at 400 K under pressure gives C. This product on acidification gives compound D (C7H6O3) which is used in medicine. Identify A) B) C and D and explain the reactions.

  22. Explain the mechanism involved in the intermolecular dehydration of alcohols to give ethers.

  23. An organic compound 'A is a sodium salt of phenolic acid with molecular formula C7H5O3Na. 'A on heating with soda lime gives compound 'B' of molecular formula C6H6O. 'B' gives violet colour with neutral ferric chloride. 'B' on treatment with C6H5COCI in the presence of NaOH gives an ester 'C' Identify 'A', 'B' and 'C'. Explain the reactions.

  24. Explain the mechanism of Cannizaro reaction.

  25. An organic compound A (C7H6O) forms a bisulphite. A when treated with alcoholic KCN forms B (C14H12O2) and A on refluxing with sodium acetate and acetic anhydride forms an add C (C9HsO2). Identify A, B and C. Explain the conversion of A to Band C.

  26. Compound (A) with molecular formula C2H4O reduces Tollen's reagent. (A) On treatment with HCN gives compound (B). Compound (B) on hydrolysis with an acid gives compound (C) with molecular formula C3H6O3 which is an optically active compound. Compound (A) on reduction with N2H/C2HsONa gives a hydrocarbon (D) of molecular formula C2H6• Identify (A), (B), (C) and (D) and explain the reactions.

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

  28. Elucidate the structure of glucose.

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

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