B.Sc. (II YEAR) SEMESTER-IV CHEMISTRY MODEL QUESTION PAPER ADIKAVI NANNAYA UNIVERSITY

ADIKAVI NANNAYA UNIVERSITY

MODEL PAPER

THREE YEAR B.Sc. DEGREE EXAMINATION

SECOND YEAR EXAMINATIONS

SEMESTER IV

Paper – IV : SPECTROSCOPY & PHYSICAL CHEMISTRY

Time: 3 hours                                                                               Maximum Marks: 75

PART- A

Answer any FIVE of the following questions.Each carries FIVE marks           5 x 5 = 25 Marks

   1.      Write Beer-Lambert’s law and its limitations

   2.      Explain the concept of chromophore.

   3.      Write a note on chemical shift in NMR spectroscopy.

   4.      Explain about VantHoff’s factor.

   5.      What is Raoult’s law?

   6.      Write about Ostwald’s dilution law

   7.      Explain about hydrogen electrode with a neat diagram.

   8.      Draw the phase diagram of Pb-Ag system.

PART- B

Answer ALL the questions.Each carries TEN marks.                                   5 x 10 = 50 Marks

    9.      (a) How do you estimate the amount of chromium in potassium dichromate and manganese in manganous sulphate spectrophotometrically

 (OR)

(b) i) Write the selection rules for electronic spectra.

      ii) How does conjugation effect λmax.?

     10.  (a) What is finger print region in IR and discuss its significance in structure elucidation

(OR)

 (b) Write the principle and applications of NMR spectroscopy.

11. (a) What is meant by osmotic pressure? Describe any one method of determination of osmotic   pressure of a dilute solution.

(OR)

 (b) What is Ebullioscopic constant? Derive the relationship between elevation in the boiling point and the molecular weight of the solute.

12. (a) Define Kohlrausch’s law. Write any two applications of it.

(OR)

 (b) Define transport number. How do you determine it by Hittorf’s method?

13. (a) Write about potentiometric titrations with one example.

(OR)

 (b) State phase rule. Draw a neat phase diagram of water system and explain different parts of the system.