|

Reg. No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FIRST/SECOND SEMESTER B.TECH DEGREE SPECIAL EXAMINATION, AUGUST 2016

> © லு

Course Code: CY100
Course Name: ENGINEERING CHEMISTRY
Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions, each question carries 2 marks
How many modes of vibrations are there in water molecule? State weather all are IR active?

Calculate the amount of electrical energy available from a dry cell corresponding to the
consumption of 6.55g zinc metal ( cell emf= 1.5۷ ,atomic wt. of Zn = 65.5)

Differentiate between the terms retention time and retention factor used in chromatography.
Write down the structures of BS and Kevlar.

Lubricants with higher aniline point are desirable. Why?

What is natural gas? Give its approximate composition.

What is the role of NH3-NH,Cl buffer solution in the determination of hardness of water by
EDTA method?

The dissolved oxygen content of a sample of water is low. What comments you can make

about the water quality?

PART छ
Answer all questions, each question carries 3 marks
Why is TMS taken as reference to determine chemical shift value in NMR spectroscopy?

. Draw a well labelled diagram of calomel electrode. Write down the electrode representation.

. What are the methods used for visualisation of spots in TLC?

. Carbon nano materials are promising materials in electronics and reinforcing field. Justify the
statement.

. A sample of fuel was found to have the following percentage composition.C-72%, H-8.2%, O-
12%, N-3.3% and ash 4.5%. Calculate HCV and LCV of coal sample.

. What is biodiesel? Write any three advantages of the fuel.

. Why chloramine is a better disinfectant than chlorine?

. Write a note on sewage water treatment by USAB process.