Chemistry  – Important Question Bank for CBSE Class XII (HSC) Board Exam 2020

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After the tremendous success of Important Questions Bank HSC (12th Std) Board Exam 20162017 and 2019 we have also created a list of Most Important Questions Bank for CBSE Class XII (HSC) Board Exam 2020 which are likely to appear in HSC Board Exams this year.

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1.What is semiconductor? What are the types of semiconductor?
2. Explain briefly anisotropic substances.
3. Define Ferrimagnetisms with an example.
4. Explain point defect. What is the difference between stoichiometric and nonstoichiometric?
5. Show a structure of polypropene.
6. How sulphure in vapour state exhibits par magnetism?
7. Distinguish between poison and promoters.
8. Explain the law of Raoult’s law stating positive and negative deviation.
9. What is the reason of gases tend to be less soluble in liquid when the
temperature is raised?
10.Explain briefly semimolar.
11.Explain briefly decimolar.
12.Explain Anionic detergent.
13.Explain half-life period of reaction.
14.Convert Ethanol to ethane.
15.Write a note on negative standard electrode potential.


16. Which cell is used in hearing aids?
17.Write a note on biodegradable polymers.
18.Explain Kohlrauc’s law.
19.Draw a diagram of PVC.
20.Convert Benzyl to Benzyl alcohol.
21.What are the steps of ‘Modern Adsorption Theory of Heterogeneous
22.Distinguish between Enzymes and Catalyst.
23. Write a note on pyrometallurgy. Explain with suitable example.
24.What is the method to produce Copper matte from copper pyrites?
25.Write the steps of separating bauxite ore to get pure alumina.
26. How is NH3 Is basic than PH3.
27. Explain N2O preparation with diagram.
28.Explain limited spectrum antibiotic with an example

29.Write a note on food preservatives.
30. What are the reasons wherein the soap does not work in hard water? Explain the cleansing soap.
31.What is Cationic detergent with an example?


32.Distinguish between thermosetting polymers and thermoplastic polymers.
33. Distinguish between Disinfectant and antiseptics with an example.
34. Explain the primary structure feature necessary for a molecule to make it useful in a condensation polymerization reaction.
35.Draw a diagram of Teflon’s
36.What are the usages of Bakelite?
37.Draw the structure for Nylon-6.
38. Alkaline are more basic than ammonia. Give reason.
39.Write a chemical test between aniline and ethylamine.
40. Ortho-nitro phenol is acidic than orthomethophenol give reason for your answer.
41. Why C-O bond is shorter than phenol? Give reason.
42.Convert Propane to propan-2-ol.
43. Write chemical distinction between C2H5Br and C6H5Br.
44.Write Linkage isomerism.
45.Write the dissociation constant of a complex.
46.Write the factors affecting the stability of a complex ion.
47.Explain lanthanide contraction.
48.Write the observation for zinc is not regarded as transition element.

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