17.

19.

20.

22:

23.

PART ८
Each question carries 10 marks
(a)Write the mathematical representation of the law governing absorption of light by

molecules of a solution. A dye solution of concentration 0.05M shows an absorbance of 0.055

at 540nm while a test solution of the same has an absorbance of 0.025 under same conditions.

Calculate concentration of test solution.

(0) What is meant by the term shielding in NMR spectroscopy? Arrange the CH3F, CHCl,

CH3Br and നച! in the increasing order of shielding effect. Give the reason for your answer.

(0) Give the reason for high 5-value of aromatic protons. (3+3+4)
OR

. (a)Define IR spectrum. Why HCI is IR active, but hydrogen molecule is not. Write the reason

for the statement.

(b) What is meant by spin-spin coupling in NMR_ spectroscopy? Predict the different types
of protons, the number of signals and the ratio of area of peaks in the NMR spectrum of CH3-
O-CH2-CH3

(c) What is MRI? How is it useful in the field of medicine? (3+4+3)
(a) Write the half-cell reactions when a Li - ion cell acts as an electrolytic cell. ۱

(b) Sketch the electrochemical cell, write the cell reactions of the following cell: Cd(s) |
CdSO,(0.01M) || CuSO,(0.5M) [Cu(s). Calculate the emf of the cell at 25 °C if the ६० cell is
0.38V. 3

(c)What are the functions of a salt bridge? (44+3+3)

OR
(a) Write the construction and working of a hydrogen oxygen fuel cell.

(b) A hydrogen electrode is immersed in a solution of pH 4.9 and is coupled withSHE.

Calculate the emf of the cell? (3)

. (a) What is HPLC? Give its principle.

(b) Give a well labelled diagram of HPLC.

(c) List two applications of HPLC.

(d) How does HPLC differ from GC? (34+3+2+2)
OR

(a)Give the principle of DTA.

(b)Give a neat labelled diagram of DTA apparatus.

(c) List applications of DTA. (3+3+4)

(a) What are nano materials? How are they classified based on dimension? Give one example

for each type.