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After the tremendous success of our last year Important Questions Bank for Uttar Pradesh Class XII HS (HSC) Board Exam 2016, we have also created a list of Most Important Question Bank for Uttar Pradesh Class XII HS (HSC) Board Exam 2017 which are likely to appear in HSC Board Exams this year.
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1.Write down the chemical equation of the laboratory method of preparation of ammonia and phosphate and also write down the chemical equation of the reaction of white phosphorus with chlorine
2. What happens, when (Write chemical equation only)
i) Ethyl acetate reacts with ammonia
ii) Acetone reacts with chloroform
iii) Acetic acid reacts with Ethyl alcohol
iv) Diethyl ether reacts with acetic anhydride
v) propanamide is heated with Br2 and caustic alkali?
3. Explain the following reactions along with the chemical equation:
a) Coupling reaction
b) Diazotization reaction.
4. What happen when?
a) Borax is heated with sulphuric acid?
b) Boric anhydride is heated at high temperature and high pressure with magnesium?
c) Silica is heated with coke at high temperature?
5. Explain the laboratory method for the preparation of acetaldehyde under the following points
a) Equation of reaction
b) Labeled diagram of the apparatus
c) Brief description of the method
6. Describe the electrolytic dispersion methods for the preparation of colloidal solution with diagram
7. Explain the similarities and dissimilarities in the properties of transitional elements and lanthanides
8. Describe with the help of labeled diagram, method for obtaining blister copper from matte and also write down chemical equations.
9. What is Micelle? Explain the cleaning action of soap.
10. Describe the solvay’s process of manufacture of sodium bicarbonate by giving chemical equations and diagram.
11. Write down the chemical equation for the preparation of any four inter-halogen compounds of chlorine, bromine and iodine with fluorine.
12. What do you understand by Vant Hoff’s factor? When 1.26 grams of NaCl is dissolved in 50 gms water, then depression in the freezing point of the solution is 153˚ C. calculate the degree of dissociation of NaCl. (The molal depression constant for water is 1.86 k kg mol – 1)
13. Write the name of main steroid hormone of glands by which it is secreted and its uses.
14. Discuss polar and non-polar covalent bonds citing example.
15. Explain Ionization Enthalpy and electron gain enthalpy
16. What is Hemoglobin? What is its function in the body?
17. Calculate the concentration of 20 volumes of H202 in gm/litre.
18. Write the equation for the synthesis properties and uses of the following polymers
a) Nylon – 66
b) P.V. C.
19. Write differences between thermosetting plastic and thermoplastic polymer.
20. Write the applications of coordinate compounds (Any four)
21. Write names of two sulpha drugs
22. Bleaching of flowers is permanent by chlorine, but temporary by sulphur dioxide why? Explain.
23. Give two examples of metallic crystals
24. Write increasing order of entropies in the following:
- water vapor
25. What is the relation between average life period and half-life period?
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