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

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 106

Part A

53 x 2 = 106
1. Name the two steps involved in the extraction of crude metal

2. List out the commercial uses of iron.

3. Write the reaction of diboranes with water and alkali.

4. Give the formula of chlorosilazanes. Explain its preparation from SiCI4.

5. Which one is more soluble in diethyl ether, anhydrous Alcl3 or hydrated Alcl3? Explain in terms of bonding.

6. How is ammonia prepared in the lab?

7. There is a huge difference between the melting and boiling points of oxygen and sulphur. Why?

8. Write ionic equation for the reaction between Cr2O7-2 iODS and Fe2+ ions in acidic medium.

9. Why transition elements form complexes? (OR) Why do d-block elements form: complexes?

10. Write the equation for the action of heat on KMnO4

11. Give the chemical formula of potassium trioxalato ferrate(III}

12. What is Co-ordination sphere?

13. What are Co-ordination isomers? Give examples

14. What is hydrate isomerism? Give an example.

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

16. Aluminium crystallises in a fee structure. Atomic radius of the metal is 125 pm. What is the length of the side of the unit cell of the metal?

17. Why is FeS not formed in stoichiometric composition?

18. Rate of chemical reaction is not uniform throughout. Justify you answer:

19. A first order reaction has a specific reaction rate of 10-3 S-1. How much time will it take for 10gm of the reactant to reduce to 2.5 gm?

20. Define neutralisation reaction.

21. Define resistance. Give its mathematical expression

22. Give the empirical relationship between molar conductance and concentration of the electrolyte.

23. What type of cell is a Daniel cell?

24. Give examples of primary cells.

25. Define electrochemical equivalent

26. What do you mean by positive and negative adsorption?

27. Define Deemulsification.

28. Explain the formation of delta.

29. How will you convert C2H5OH to C2H5OC2H5?

30. How is the following conversion effected? Ethyl alcohol ⟶ Ethylene glycol

31. Write the tests to differentrate phenol and alcohol.

32. What happens when crotonaldehyde is reduced in the presence of LiAlH4?

33. Give four examples of carbonyl compounds?

34. Give nucleophilic addition reaction of acetaldehyde with NaHSO3

35. How is Schiff's base prepared?

36. What are carboxylic acids?

37. Write a note on esterification reaction with an example.

38. Write any three uses of formic acid.

39. Write a note on Claisen Condensation.

40. What is chloropicrin?

41. How will you distinguish between ethylamine and diethylamine?

42. Explain why amines are more basic than amides.

43. ${ C }_{ 2 }{ H }_{ 3 }N\xrightarrow [ Ether ]{ LiAl/{ H }_{ 4 } } B\underrightarrow { HN{ O }_{ 2 } }$ Identify A, Band C

44. How is anisole prepared from benzene diazonium chloride?

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

46. What are anomers? Give example.

47. Why cellulose is not used as food by humans?

48. Write the main structural difference between RNA and DNA of the four bases, name those which are common to both RNA and DNA.

49. What do you mean by transcription?

50. Give an example of a macromolecule chosen as drug targets.

51. What are Antacids? Give three examples of antacid.

52. Write a short note on Antimicrobials.

53. Name a drug used in mental depression.