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Important 2 Mark Creative Questions (New Syllabus) 2020

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 94

    Part A

    47 x 2 = 94
  1. Name some reducing agents used to convert Metal oxides to metal

  2. What is distillation?

  3. Explain the formation of boron trifluoride.

  4. What is inert pair effect?

  5. How is ammonia prepared in the lab?

  6. Explain Why inspite of nearly the same electronegativity, nitrogen forms hydrogen bonding while chlorine does not - Give reason.

  7. Why lanthanoids are called f block elements?

  8. What is hydroformylation of olefins?

  9. Give the names of two complexes which are used in medicines.

  10. Give reason for the following:
    Optical isomerism is not shown by square planar complexes.

  11. Give the formula and IUPAC ligand name for Ethylenediamine.

  12. What are anionic & cationic complex? Give an example.

  13. Ionic solids conduct electricity in molten state but not in solid state. Explain.

  14. A compound forms hexagonal dosed packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?

  15. The decomposition reaction of ammonia gas on platinum surface has a rate constant R = 2.5 X 10-4mol L-1. What is the order of the reaction.

  16. Give a condition for a compound to be precipitated.

  17. How is common ion effect related to the solubility of the electrolyte?

  18. Define conductance. Give its unit

  19. Define electrolysis.

  20. Give examples of primary cells.

  21. What are the concepts of catalysis that intermediate compound formation theory throws light on?

  22. Tanning makes leather get hardened-Explain why?

  23. Adsorption of a gas on the surface of solid is generally accompanied by decrease in entropy. Still it is a spontaneous process. Explain.

  24. How will you convert of ethylene glycol to 1,4 - dioxane.

  25. What is 'Glycerose'? How is it prepared from glycerol?

  26. Name the only primary alcohol which gives positive iodoform test.

  27. Does formaldehyde undergo aldol condensation? Justify your answer

  28. What is aldol condensation?

  29. Benzaldehyde reduces Tollen's reagent but not Fehling's solution explain.

  30. Acetone is soluble in water but benzophenone is not. Give reason.

  31. Mention the inductive effect in monochloro acetic acid.

  32. Lower aliphatic carboxylic acids are soluble in water where as higher ones are insoluble. Give reason

  33. Amides are amphoteric in nature. Justify.

  34. Two isomers having the molecular formula C2H5NO2 on hydrolysis in acidic medium gives (A) and (B). Identify (A) and (B) and explain the reactions involved.

  35. Write the name and structure of four isomeric amines having the molecular formula C3H9N

  36. Explain why amines are more basic than amides.

  37. Bring about the conversion of Chlorobenzene to aniline

  38. Can aniline be prepared by Gabriel phthalimide reaction? Justify your answer.

  39. How is anisole prepared from benzene diazonium chloride?

  40. Write a note on addition reactions of alkyl isocyanides.

  41. What is meant by blood sugar?

  42. Name the two types of nucleic acids.

  43. ExpIa·m mu taro tatiIon m. gIucose.

  44. What are drug targets?

  45. Common salt is added to the preparation of glycerol by saponification. Give reason.

  46. Give an example of bacteriocidal antobiotic.

  47. Explain why chloroform is not used as an anaesthetic.

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