Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 2nd Semester (Second Semester) 2016-17 NAS202 Engineering Chemistry Question Paper
T ime : 3 Hours
Note .' Be precise in your answer. In case ofnumericalproblem assume data wherever not provided.
RouNo.| | | | | | | | | | | NAS202
B.TECH.
THEORY EXAMINATION (SEM?II) 2016-17
ENGINEERING CHEMISTRY
Max. Marks : 100
SECTION ? A
1. Explain the following: 10 x 2 = 20
(a) What do you understand by temporary and permanent hardness of water.
(b) Why [3 carotene absorbs light in Visible region?
(c) Explain why the value ofNCV is greater than GCV.
(d) Explain the bonding and antibonding molecular orbitals .
(e) Define polymer and polymerization.
(1) What is unit cell? What are its types?
(g) What is meant by elastomers?
(h) Calculate the bond order of 02?
(i) Predict the number of signals in CH3CH20H.
(j) Explain Priming and Foaming.
SECTION ? B
2. Attempt any ?ve of the following questions: 5 x 10 = 50
(a) (i) What is metallic bond? Explain it on the basis of Molecular Orbital theory.
(ii) With the help of MO diagram, calculate the bond order, nature of the following:
N2 & 02
(b) (i) Differentiate between addition and condensation polymerization with suitable
examples?
(ii) Write the method of preparation for the following polymers:
(i) PMMA (ii) Orlon (iii) Polystyrene
(c) (i) Discuss the Zeolite method for water softening.
(ii) The hardness of 1000 liters of a water sample was completely removed by
passing it through a zeolite softener. The softener then required 30 liters of
NaCl solution containing 1.5 g/l of NaCl for regeneration. Calculate the
hardness of the sample of water.
(d) (i) Write possible optical isomers in tartaric acid.
(ii) What is the difference between enantionmers and diastereoisomers?
(e) (i) Define the terms chromophore and auxochrome in UV spectroscopy.
(ii) A compound havingconcentrationl0'3g/l resulted absorbance value 0.20 at max
510 nm using 1.0 cell. Calculate it absorptivity and molar absorptivity values.
Molecular weight of compound is 400.
(1) What is electrochemical corrosion? Write down the mechanism involved in
electrochemical corrosion. Calculate the amount of rust (Fe203.3H20) formed by
complete rusting of 1 kg of iron.
(g) Describe the structure of graphite. How it acts as conductor of electricity. Show, how
does the SN2 reaction give rise to inverted product while SNl reaction gives a racemic
mixture.
(h) Show, how does the SN2 reaction give rise to inverted product while SNl reaction gives
a racemic mixture.
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30
3 (i) What is biogas? How biogas is produced? With the help of diagram, explain
Biogas Plant.
(ii) What is potable water? What are its chemical requirements?
4 (i) What are bio degradable polymers? Discuss their applications?
(ii) How do you prepare the following polymers? (a) Bakelite (b) Perspex (c) Cis?
1,4?polyisoprene cross linked through non metal
5 (i) For a XY2 bent molecule show various types of stretching and bending
Vibrations in IR
(ii) Calculate temporary and total hardness of a water sample containing: Ca
(HC03)2=17.4 mg /lit, Mg (HC03)2 =9.3mg/lit, CaSO4 = 12.6 mg/lit and MgClz
= 8.7 mg /lit.
This post was last modified on 29 January 2020