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#### Sample 2 Mark Creative Questions (New Syllabus) 2020

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 114

Part A

57 x 2 = 114
1. What is meant by concentration?

2. Write the two similarities between calcination and roasting.

3. Name and discuss the principle involved in obtaining silicon of high purity.

4. Mention the physical properties of boranes.

5. What are the uses of silicon tetra chloride?

6. Give two uses of nitrogen

7. Why does ozone act as a powerful oxidising agent?

8. What are coinage metals?

9. Silver atom has completely filled d-orbitals (4d10) in its ground state. How can you say that it is a transition element?

10. How are interstitial compounds formed?

11. What is the coordination number of central metal ion in [Fe(C2O4)3]3-?

12. Name a complex used in the treatment of cancer.

13. What is Co-ordination polyhedron?

14. What are enantiomers?

15. Which point effect in crystal doesn't alter the density of the relevant solid?

16. Write a note on the assignment of atoms per unit cell in body centred cubic lattice or CsCl.

17. 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?

18. How does the value of rate constant vary with reactant constant.

19. Mention the factors that affected the rate of a chemical reaction.

20. Define neutralisation reaction.

21. Calculate the ionisation constant for the conjugate base of HF. Ionisation constant of HF at 298 K is 6.8 X 10-4

22. Define resistivity

23. Express Kohlraush's law for molar conductance of a uni - univalent electrolyte NaCl

24. Give the uses of mercury button cell.

25. What is the principle used in secondary batteries to regenerate the original reactants?

26. How are specific and equivalent conductances related?

28. What happens when a colloidal sol of AS2S3 and Fe(OH)3 are mixed?

29. Explain the formation of delta.

30. How will you convert C2H5OH to C2H5OC2H5?

31. Give the IUPAC names of
(i) CH3CH(OH)CH2OH
(ii) HO-CH2-CH2-OH
(iii) ${ { CH } }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -COOH$

32. Give a test to identify whether a given -OH group is alcoholic or phenolic in nature.

34. What is aldol condensation?

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

36. Explain Gattermann - Koch reaction

37. Mention the inductive effect in monochloro acetic acid.

38. Give any three uses of benzoic acid.

39. Write a test to distinguish C2H5OH and CH3COOH.

40. Amides are amphoteric in nature. Justify.

41. 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.

42. What happens when acetonitrile is hydrolysed?

43. Explain why amines are more basic than amides.

44. An aromatic simplest nitro compound A on reduction using Sn and HCI gives B. B undergoes carbylamine reaction. Identify A and B. Give anyone use of compound A.

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

46. Write a reaction to show the conversion of acetic acid to benzoic acid.

47. What is 'spirit of nitre'? Give its use.

48. What are anomers? Give example.

49. Define isoelectric point.

50. Name the two types of nucleic acids.

51. What do you mean by zwitter ion?

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

53. Explain the term target drug action used in medicinal chemistry?

54. What are Local anaesthetics? Give its use.

55. How are polymers classified?

56. What is Condensation polymerisation?

57. Saccharin is 550 times sweeter than sugar, yet used to prepare sweets for diabetic patient - Give reason.