Download OU B.Sc 2019 Dec 3rd Sem (2nd Year) 8066E Chemistry (DSE) Question Paper

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B.Sc. Ill-Semester (CBCS) Examination, November / December 2019

Chemistry (DSC)

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Paper - II

Time : 3 Hours Max. Marks: 80

PART - A (5 x 4 = 20 Marks)

(Short Answer Type)

Note : Answer any FIVE of the following questions.

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1. What is Lanthanide contraction and write its consequences?
2. Write a note on alkali metals in ammonia.
3. Mention the products for the following reactions.
   
   CH₃OH
   

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   H₂O
   
   
4. State Williamson's synthesis and give its reaction.
5. Write a short note on the triple point of the water system.

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6. What is Hardy-Schultz law? Explain.
7. What are fullerenes? Give two examples.
8. Write the absolute configuration (R, S - configuration of the following compounds).
   
   
   

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   OH
   
   NH₂
   
   

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PART - B (4 x 15 = 60 Marks)

(Essay Answer Type)

Note: Answer ALL from the questions

1. (a) Explain how lanthanides are separated by solvent exchange method.
   

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   OR
   (b) Define symmetry and explain the types of symmetry.
2. (a) Write the mechanism for (i) Aldol condensation (ii) Cannizzaro reaction.
   OR
   (b) Explain the following tests:
   

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   (i) 2,4 -DNP test (ii) Tollen's test (iii) Schiff's test
3. (a) State the Gibb's phase rule and explain the lead-silver system.
   OR
   (b) Explain physical adsorption and chemical adsorption. Derive Langmuir's adsorption isotherm equation and its logarithmic form.
4. (a) What are nanomaterials and explain the applications of nanomaterials.
   

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   OR
   (b) Explain the synthesis and applications of carbon nanotubes.

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