Chemistry – Important Question Bank for Tamil Nadu (12th Std) HSC Board Exam 2020

CHEMISTRY – IMPORTANT QUESTION BANK 2020

1. Distinguish between Nuclear Fusion and Fission reactons.
2. Explain the experimental determination of rate constant for decomposition of H₂O_{2 ­}in aqueous solution.
3. Write a note on molecular crystals.
4. Explain Bragg’s spectrometer method.
5. K_spof Ag₂ CrO₄ is 1×10−121.1×10−12.what is solubility of Ag₂ CrO₄ in 0.1M K₂ CrO₄.
6. Write the uses of Lanthanides and actinides.
7. Difference thermoplastic and thermosetting.
8. Explain the factors affecting Ionization Energy.
9. What are bio degradable polymers? Give examples.
10. Mention the function of hemoglobin in natural process.
11. Write the potulates of Werner’s theory on co-ordination compound.
12. What happens when KI solution is added to an aqueous solution of copper sulphate?
13. Write a note on Auto catalyst and promoters. Write the general characteristic of catalytic reactions.
14. Illustrate tribasic nature of orthophospheric acid, reducing property of phosphorus acid.
15. Give the methods of preparing diethyl ether.

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16. How is anisole prepared? Write its chemical properties and uses.
17. What is the electrochemical equivalent of a substance when 150gm of it is deposited by 10 ampere of current passed for 1 sec?
18. How is Cr₂O₃ reduced to chromium by aluminothermic process?
19. Account for the acidic nature of HClO₄. In terms of Bronsted – Lowry theory, identify its conjugate base.
20. What are superconductors? Write their uses.
21. Identify the product (s) is / are formed when 1 – methoxy propane is heated with excess HI. Name the mechanism involved in the reaction
22. Explain the cell terminologies used in Electrochemical cell.
23. The uncertainty in the position of a moving bullet of mass 10g is 10^-5m calculate the uncertainty in its velocity.
24. Discuss the position of Lanthanides in the period table. Discuss the the extraction of Lanthanides from monazite sand.
25. How will you convert potassium chromate to potassium dichromate? Mention the colour change involved in the reaction.
26. Mention the uses of Helium.
27. Give evidence to show glucose has an aldehyde group, 6 carbon linear chain, and 5-OH groups. How is Nylon 66 prepared?
28. What is indicator used for the titration between oxalic acid and sodium hydroxide? Justify your answer with suitable answer.
29. Explain Ostwald’s dilution law.
30. How does Fluorine differ from other halogens?

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31. Draw the Molecular Orbital diagram for Oxygen molecule and calculate its Bond order. How do electro – negativity values help to find the nature of bond?
32. How is Cr₂O₃ reduced to chromium by aluminothermic process?
33. The K_a of propionic acid is 1.34×10^-5 . What is the PH of a solution containing 0.5M propionic acid and 0.5M sodium propionate?
34. Disassociate equilibrium constant of HI is 2.06× 10^-2 at 458⁰ C. at equilibrium, concentration of HI and I ₂ are 0.36M and 0.15M respectively. What is equilibrium concentration of H₂at 458⁰ C?
35. How is oxalic acid prepared by? Laboratory method and industrially from sodium formate.
36. Discuss the structure of AX₃ and AX₇ interhalogen compound.
37. How can colloidal solution be purified by dialysis?
38. Prove that P₂O₅ is powerful dehydrating agent.
39. Substantiate with suitable evidence that in fructose the key=tone group in adjacent to one of the terminal carbon atom.
40. Write note on quinonoid theory of indicators.