17.

16

2

௮

23.

PART C
Each question carries 70 marks
(a) State the principle of vibrational (IR) spectroscopy. Arrange the following bonds in the

order of increasing stretching frequencies C-C, C=C and CEC; Write suitable explanation for
your answer, (5)
(b)What is spin-spin splitting? Write the splitting pattern in the NMR spectrum of CH2CI-CH2-
CHCl. (3)

(c)Write two important applications of electronic spectroscopy. (2)

OR

. (a) Explain the principle of NMR spectroscopy. Which of the following nuclei can have a

presence in NMR spectrum? ൫൮00൫) (८ (iii) {H. Reason for your answer. (4)

(b) Define chemical shift. Interpret the number of signals, the position of signals and the

intensity of signals in the NMR spectrum of CH3;CH2CH)CI. (4)
(c) Most absorption bands in the electronic spectra are very broad. Give reason. (2)
. (a) How is a calomel electrode constructed? Sketch the electrode. (4)
(0) Give the working principle of H2-O2 fuel cell with cell reactions. (4)

(c) A hydrogen electrode at 25°C is immersed in a solution of pH 2.5 and coupled with the
half-cell SHE. Calculate the emf of the cell. (2)
OR

. (a) How does a lithium-ion 0611 work? Write the cell reactions. (4)

(b) Calculate the emf of the following cell at 25 °C;
Zn | Zn?" (a= 0.0004) | Cd?*(a=0.2) | 04:

Given ६" Zn** | Zn = -0.76 ५ ; E° 207 | Cd = -0.403 V (3)

(௦) Give the principle of acid-base titration by potentiometry. (3)

. (a)Draw the block diagram of TGA apparatus. (4)

(b)State the principle and applications of GC. (4)

(c)Write the demerits of TGA. (2)
OR

. (a) What is the basic principle of thermo gravimetric analysis? List its important applications.

(b)Write experimental arrangement and procedure for measuring conductance of an electrolytic
solution.

(c) List important applications of TLC. (3+4+3)
(a) How is polyaniline synthesised? Mention two applications of polyaniline.

(b) Write a note on OLED.