Chemistry -Important Question Bank for JKBOSE (Summer Zone & Winter Zone) HSC Examination 2016

Long Questions Marks 5:

1.What is solubility? Explain the effect of temperature and pressure on the solubility of gases in liquids.

2.  What is colligative property? How is the molecular mass of a solute calculated from elevation in boiling point? 1 gms of a non-electrolyte solute dissolved in 50_g of benzene lowered the freezing point of benzene by 0.40 K. The K_b value of benzene 5.12 KKgmol^-1. Find the molar mass of the solute.

3. Why molar conductivity of weak electrolytes cannot be calculated from extrapolation method? Explain how the molar conductivity of weak electrolytes is calculated from Kohlrauch’s law?

4. Depict a galvanic cell in which the reaction is

 Zn(s) + Cu2⁺(aq)   ⇒      Zn²⁺(aq) + Cu(s)

i. Which of the electrodes is negatively charged?

ii.What are the carriers of current in the cell?

iii. What is the individual reaction at each electrode?

vi. What are the functions of salt bridge?

5. Name the oxoacids of Phosphorus. Predict their basicity form their structure. Which of the two H3PO3 and H3PO4 is stronger?

6.  What are interhalogens? How are they produced? Give the structure of IF7.

7. How will you distinguish between?

i. Ethanol and acetone

ii. acetaldehyde and benzaldehyde

iii. Tollen’s and Fehling’s test?

8.  Describe the following.

i. Cannizaro’s reaction

ii. Aldol condensation

iii. Cross Aldol condensation

Short Questions Marks 3:

9. In a solid, there is defect due to missing of equal number of opposite ions from normal lattice site.

i. Which type of point defect is it?

ii. What are the effects of this defect on the density and stability of such solids?

iii. Name a solid which can have such defect.

10. What is meant by reaction rate? Give symbolic expression and units for the reaction

CO (g) + NO2 (g)   ⇒   CO2 (g) + NO(g)

11. Write the hybridization and also draw the molecular structure of following.

XeF2, XeF4, XeF6

12. Briefly describe Freundlich adsorption isotherm.

13. How pure alumina is prepared form bauxite in Baeyer’s process? Give the reaction of each step.

14. Atomic radius of Cu is greater than Cr but ionic radius of Cr²⁺ is greater than Cu^2+. Why?

15. How will you distinguish between 1⁰, 2⁰ and 3⁰ alcohols by Victor Meyer’s method?

16. Amines are basic in nature. Justify.

Very Short questions Mark 2:

17. Freons cause destruction of ozone layer. Explain.

18. Why CN^– and SCN^– are known as Ambidient ligands? What type of isomerism is caused by such ligands?

19. Give cyclisation of Glucose.

20. What are fat soluble and water soluble vitamins?

21. Explain SN2 mechanism in alkyl halides.

22. What happens to natural rubber when it is heated with sulphur? What is the process known as?

23. What are antibiotics and antipyretics? Give Example?

24. What is lanthanide contraction? How it is caused?

25. What is CMC?

26. What is the effect of mechanical pressure on a piezoelectric crystal?

27. Give the units of zero order reaction.

28. Give the reaction for converting acid chlorides to corresponding aldehydes. Name the reaction.

29. Name one biodegradable polymer.

30. What is the coordination number of central metal atom in [Fe (C2O4)3]3-

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