Chemistry  – Important Question Bank for CBSE Class XII (HSC) Board Exam 2019

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After the tremendous success of Important Questions Bank HSC (12th Std) Board Exam 2016 and 2017 we have also created a list ofMost Important Questions Bank for CBSE Class XII (HSC) Board Exam 2019 which are likely to appear in HSC Board Exams this year.

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  1. Aromatic diazonium salts are more stable than aliphatic diazonium salts.
  2. Dioxygen is a gas while Sulphur is a solid at room temperature.Give reasons.
  3. Draw the structures of XeF4
  4. (CH3)2NH is more basic than (CH3)3N in an aqueous solution.
  5. Give a simple chemical test to distinguish between Aniline and N,N-dimethylaniline.
  6. When Cl2 reacts with excess of F2, ClF3 is formed and not FCl3. Give reasons
  7. Define fuel cell and write its advantages.
  8. Conductivity of CH3COOH decreases on dilution.
  9. H3PO3 undergoes disproportionation reaction but H3PO4 does not. Give reasons
  10. Draw the structures of HClO3
  11. What is a biodegradable polymer? Give an example
  12. Why did Shyam refuse to accept the items in polythene bags?
  13. What happens when a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount of FeCl3 solution ?
  14. Iron has higher enthalpy of atomization than that of copper. Give reasons
  15. Write one structural difference between low-density polythene and high-density polythene.
  16. What type of isomerism is exhibited by the complex [Co(NH3)5Cl]SO4 ?
  17. Write the product when D-glucose reacts with conc. HNO3.
  18. Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured. Give reasons
  19. Amino acids show amphoteric behaviour. Why?
  20. Write one difference between alpha helix and beta pleated structures of proteins.
  21. What is tincture of iodine? Write its uses.
  22. Write the structure of the product when chlorobenzene is treated with methyl chloride in the presence of sodium metal and dry ether.
  23. Why is bithional added to soap?
  24. Aquatic animals are more comfortable in cold water than in warm water. Give reasons
  25. Write the structure of the alkene formed by dehydrohalogenation of 1-bromo-1-methylcyclohexane with alcoholic KOH.
  26. Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.
  27. What happens when an emulsion is centrifuged?
  28. Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers. Give reasons
  29. Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed by aqueous NaOH and why?

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