Chemistry – Important Question Bank for Uttarakhand ( (UBSE) HSC 2016 Examination

CHEMISTRY (Theory)

1. An organic compound ‘A’ contains 69.770/o carbon, 11.63% Hydrogen and rest Oxygen. The molecular mass of the compound is 86. It does not reduce Tollen’s reagent but forms an addition compound with Sodium hydrogen sulphite and gives positive Idoform test. On vigorous oxidation it gives ethanoic acid and paranoiac acid. Write the possible structure of the compound oA’ by explaining every step.
2. Explain the structure of Carbonyl group.
3. How will you bring about the following conversions in not more than two steps -i) Propanone to Propene
   ii) Benzoic acid to Benzaldehyde
4. Explain that why acetaldehyde gives aldsl condensation while formaldehyde does not ?
5. Give the reasons of following – 

a) PH₃ has lower boiling point than NH₃.

b) H₂O is a liquid and H₂S a gas.

c) Helium is used in diving apparatus

d) Dinitrogen is less reactive at room temperature.

e) ICI is more reactive than I₂

f) Noble gases have very low boiling point.

g) Sea is the greatest source of some halogens

h) Dioxygen is a gas but sulphur a solid

i) It is necessary to use a silent electrical discharge in preparation of ozone.

6.Why are the elements of Group 18 known as noble gases ? Noble gases have very low boiling point. Why ?

7. Describe the manufacture of NH₃ by Haber’s process with diagram

8. Explain the effect of catalyst on rate of reaction and activation energy.

9. A first order reaction is 7 5  complete in 60 minute. Find the half-life of this reaction

10. Differentiate between molecularity and order of a chemical reaction

11. Derive the integrated rate equation of first order reaction

12. Clarify the difference between fibrous and globular proteins.

13. Give the mechanism of nucleophiiic addition reactions in reference to aldehydes and ketones.

14. An organic compound ‘A’ contains 69.77 % carbon, 11.63 % Hydrogen and rest Oxygen. The molecular mass of the compound is 86. It does not reduce Tollen’s reagent but forms an addition compound with Sodium hydrogen sulphite and gives positive Idoform test. On vigorous oxidation it gives ethanoic acid and propanoic acid. Write the possible structure of the compound ‘A‘ by explaining every step.

15. How the rate constant of a reaction is related to its activation energy ? Clarify

16. What is meant by DNA Fingerprinting ? Give its main uses.

17. What are interhalogen compounds ? Why are they more reactive than halogens ?

18. Describe the manufacture of Ammonia by Haber’s Process with diagram

19. Derive the integrated rate equation for first order reaction

20. A first order reaction has a specific reaction rate of 2.31 x 10^-3 sec^-1 of the reaction. Calculate the half-life

21. Write the following name reactions with chemical equations –

1. Arnmonolysis
2. Hof frnann Bromamide Reaction
3. Coupling reaction

22. What are primary, secondary and tertiary alcohol ? What happens when primary, secondary and tertiary alcohols are passed over heated copper at 570 K?’

23. Which of the ‘d’ block elements may not be regarded as the transitional elements ?

24. What is secondary Battery ? Write the mechanism of recharging of lead storage battery with the help of chemical reactions.

25. Draw a labelled diagram of Blast Furnance, and write down the reactions taking place in different zones in the blast furnace during the extraction of iron

26. Write the equation of chemical reactions involved in the preparation of the following –

i) XeF₄   ii) H₃PO₃

27. What are biodegradable and non-biodegradable detergents ? Give one example of each

28.  The osmotic pressure of a solution containing 45 g of sucrose dissolved per liter of solution at 20″C is 3.2 atm. Calculate the value of constant R. (molecular weight of sucrose =342).

29. Differentiate between tetrahedral void and octahedral void.

30. Explain the following –  1. Molality     2. Mole fraction

32. 4 _g of caustic soda (molar mass = 40) is dissolved in water and solution is made to 200 cm³. Calculate the molarity of the solution.

33. State the Faraday’s law of electrolysis.

34. Write the name of two Fat soluble vitamins.

35. Give two examples of sulpha drugs

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