B B2101 Pages: 2

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST/SECOND SEMESTER B.TECH DEGREE EXAMINATION, JULY 2018
Course Code: CY100
Course Name: ENGINEERING CHEMISTRY

Max. Marks: 100 Duration: 3 Hours
PART A

Answer all questions, each carries 2 marks Marks
1 HCl 15 IR active but N> is not. Why? (2)
2 List out the advantages of fuel cell. (2)
3 What are the visualisation techniques used in TLC for colourless compounds? (2)
4 Give the structure of ABS polymer. List two properties. (2)
5 What are the functions of lubricants? (2)
6 Indicate the significances of flash and fire points. (2)
7 A sample of water contains 325 mg of MgSO, per litre. Calculate the hardness in (2)

terms of CaCO; equivalents. (Equivalent weight of MgSO.= 60).
8 Briefly explain any one method for disinfection of water. (2)
PART 8
Answer all questions, each carries 3 marks
9 Distinguish between absorption spectrum andemission spectrum. (3)
10 Calculate the emf of the following cell, Zn(s)/Zn”'(0.3M)//Ag’ (0.04 M)/Ag(s) 36 (3)
25°C. Write the cell reaction. The 89001115 1.56 V at 25°C.

11 Define retention factor and retention time. (3)
12 Brief out fullerenes. Give two properties. (3)
13 Define Cetane number and indicate its significance. (3)

14 A Sample of coal contains: C = 70%, O = 14.7%, H = 10%, S 5% and 0.3% (3)
ash. Calculate GCV and NCV of coal using Dulong’s formula. Given latent heat
of steam=587cal/g.

15 What is the principle behind ion exchange process for softening of water? (3)
16 Define COD and comment on the significance of COD. (3)
PART C
Answer all questions, each carries 10 marks
17 a) Explain the basic principle and instrumentation of UV-Visible spectroscopy (5)

b) What is meant by spin-spin splitting? Predict the number of signals and splitting (5)
pattern of the NMR spectrum of CH;CH2OH.
OR
18 a) State Beer-Lambert’s law. A solution shows a transmittance of 30%, when taken (5)
in a cell of 4 cm thickness. Calculate the concentration of the solution, if the
molar absorption coefficient is 3000 dm*mol ‘cm.
b) How many vibrational modes are possible for (02 and H2O? Sketch the possible (5)
vibrational modes for both.

19 a) Explain the working of calomel electrode with a neat sketch. (5)

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