Reg No.

Max. Marks: 100

@ ~ @ ८ BR WwW

a)
b)

A192002

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FIRST SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Course Code: CY100
Course Name: ENGINEERING CHEMISTRY

PART A
Answer all questions, each carries 2 marks.
Which of the following molecules show UV-visible absorption spectrum?

Explain(a) methane (0) benzene (0) 1,3-butadiene (प) cyclohexene
Calculate the amount of electric energy available from a dry cell which
consume 6.55g Zn. given that emf of the cell is 1.5 V and atomic weight of Zn
is 65.5 प

Explain elution.

What is ABS?

Calculate the HCV 08011, using Dulong’s formula.

Why graphite can act as a solid lubricant?

Define temporary and permanent hardness of water with examples.

Give the advantages and disadvantages of chlorination of water.

PART B
Answer all questions, each carries 3 marks.
Sketch the molecular orbital energy diagram of 1,3 butadiene and show HOMO

and LUMO transition. What happens to wavelength of absorption maximum
when more double bods come in conjugation?
What are the functions of a salt bridge?
List out the applications of TGA.
Sketch OLED display device, Which region (p or n) is emissive layer, why?
What are Greases? Where they are used? Give the composition of calcium-
based grease and axial grease.
Define a chemical fuel. How are they classified? Give suitable examples.
Explain the steps involved in the treatment of water for drinking purpose.
Define COD and BOD. Why COD is always greater than BOD?
PART C

Answer all questions, each carries10 marks.
State Beer-Lambert’s law and derive its integrated form.
Draw high resolution NMR spectrum of CH3-CH2-O-CH2-CH3. Explain the

reason for chemical shift and spin-spin splitting pattern.

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Duration: 3 Hours

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