jkbose.co.in : Class XII Chemistry Question Paper Model Jammu & Kashmir State Board of School Education

Name of the Board : Jammu & Kashmir State Board of School Education
Name of the Exam : Class XII
Subject : Chemistry
Document Type : Model Question Paper
Website : jkbose.co.in

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/jkbose.co.in/6981-Chemistry.pdf

JK Bose Chemistry Model Question Paper

The Jammu and Kashmir State Board of School Education :
Academic Division New Campus, Bemina, Srinagar Model Paper
Class  : 12th)
Max Marks: 70
Time: 3Hrs

Related : Jammu & Kashmir State Board of School Education Class XII Political Science Question Paper Model : www.pdfquestion.in/6980.html

SECTION A

Long Answer Type Questions:
1. What is solubility? Explain the effect of temperature and pressure on the solubility of gases in liquids.
OR
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 50g of benzene lowered the freezing point of benzene by 0.40 K. The Kb value of benzene 5.12 KKgmol-1. Find the molar mass of the solute. 5 marks
2. 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?
OR
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?
(iv) What are the functions of salt bridge? 5 marks
3. Name the oxoacids of Phosphorus. Predict their basicity form their structure. Which of the two H3PO3 and H3PO4 is stronger?
OR
What are interhalogens? How are they produced? Give the structure of IF7. 5marks
4. How will you distinguish between?
(i) Ethanol and acetone
(ii) acetaldehyde and benzaldehyde
(iii) Tollen’s and Fehling’s test?
OR
Describe the following.
(i) Cannizaro’s reaction
(ii) Aldol condensation
(iii) Cross Aldol condensation 5marks

SECTION B

Short Answer Type Questions:
5. In a solid, there is defect due to missing of equal number of opposite ions from normal lattice site. 3 marks
(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.
6. What is meant by reaction rate? Give symbolic expression and units for the reaction 3 marks
CO (g) + NO2 (g) CO2 (g) + NO(g)
7. Write the hybridization and also draw the molecular structure of following. 3 marks
XeF2, XeF4, XeF6
8. Briefly describe Freundlich adsorption isotherm. 3 marks
9. How pure alumina is prepared form bauxite in Baeyer’s process? Give the reaction of each step. 3 marks
10. Atomic radius of Cu is greater than Cr but ionic radius of Cr2+ is greater than Cu2+. Why? 3 marks
11. How will you distinguish between 10, 20 and 30 alcohols by Victor Meyer’s method? 3 marks
12. Amines are basic in nature. Justify. 3 marks

SECTION C

Very Short Answer Type questions:
13. Freons cause destruction of ozone layer. Explain. 2 marks
14. Why CN- and SCN- are known as Ambidient ligands? What type of isomerism is caused by such ligands? 2 marks
15. Give cyclisation of Glucose. 2 marks
16. What are fat soluble and water soluble vitamins? 2 marks
17. Explain SN2 mechanism in alkyl halides. 2 marks
18. What happens to natural rubber when it is heated with sulphur? What is the process known as? 2 marks
19. What are antibiotics and antipyretics? Give Example? 2 marks
20. What is lanthanide contraction? How it is caused? 2 marks

SECTION A :
Very Short Answer Type Questions :
21. What is the effect of mechanical pressure on a piezoelectric crystal? 1 mark
22. Give the units of zero order reaction. 1 mark
23. What is CMC? 1 mark
24. What is the coordination number of central metal atom in [Fe (C2O4)3]3- ? 1 mark
26. Give the reaction for converting acid chlorides to corresponding aldehydes. Name the reaction. 1 mark
27. Name one biodegradable polymer. 1 mark
28. The correct structure of drug paracetamol is 1 mark

Long Answer Type Questions :
. Define Hormone and write down the characteristics of Steroid Hormones.
Or
Describe in brief the Chemistry and Biochemical functions of Prostaglandins.

. Explain the Biochemical functions of Thyroid hormones.
Or
What is Calcito’nin ? Give the chemistry as well as biochemical functions of Calcitonin.
Define Enzyme and give the brief classi?cation of Enzymes. I
Or
Describe the various factors affecting the Enzyme activity.
Explain in brief the Phenomenon of B-oxidation.
Or
Describe the mechanism of Ketogenesis.
. Describe the Biosynthesis of Pyrimidines-Nucleotides.
Or
Explain the Phenomenon 0f Purine Biosynthesis. 5