B.TechSemester 22021-22Engineering ChemistryKAS202T

Engineering Chemistry (KAS202T) - AKTU Question Paper 2021-22

B.Tech · Semester 2 · Free PDF Download

This is the official AKTU Engineering Chemistry Previous Year Question Paper for B.Tech Semester 2, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 2

Session:2021-22

University:AKTU / UPTU

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Questions Asked in 2021-22

Engineering Chemistry (KAS202T) — complete question paper

Section AAttempt All of the following Questions in brief Marks(10X2=20) CO BL

a
Explain why helium is monatomic and hydrogen is diatomic? 1 2
b
Arrange the following molecules or ions in increasing order of bond stability
c
A solution shows a transmittance of 20%, when kept in a cell of 2.5 cm thickness. Calculate its concentr ation if the molar absorption coefficient is 12000 dm3mol-1cm-1
d
What are Raman active molecules?
e
Why KCl ̶ NaCl – H2O should be regarded as a 3 components system, Whereas KCl ̶ NaCl ̶ H2O should be regarded as 4 components system?
f
Calculate the EMF of the cell reaction: Zn / Zn 2+ [0.1M] || Cu 2+[0.2M] / Cu Standard reduction potential of Zn 2+ and Cu 2+ are -0.76V and 0.34V respectively
g
0.4 gm of a coal sample was used in bomb calorimeter for the de termination of calorific value .The ash formed in the bomb calorimeter was extracted with acid and the acid extracted was heated with BaCl 2 solution and a precipitate o f BaSO4 was formed .The precipitate was filtered dried and weighted. T he weighted of precipitate was to 0.04 gm Calculate the percentage of sulphur in the sample?
h
A sample of hard water has hardness 500 ppm. express the hardne ss in ofr and Q1(i) Write monomers of Buna-S and Nylon 66? 5 2 Q1(j) Write structure of Ferrocene and Dibenzene chromium. 5 2

Section BAttempt ANY THREE of the following Questions Marks(3X10=30) CO BL

a
(i) Explain the applications of Graphite and comment upon the e lectrical and lubrication property of Graphite?
b
Define the principle of Raman spectroscopy. Explain the term ch romophore and auxochrome in UV Spectroscopy?
c
Explain the mechanism of electrochemical theory of corrosion with the help of hydrogen evolution and oxygen absoption reactions. Describe cathodic protection in detail

(i) Write the process of lime soda softening.

(ii) Calculate the amount of lime and soda required for the treatmen t of
20000 lts. of water whose analysis is as follows:
Ca(HCO3)2 = 40.5; Mg(HCO 3)2 =36.5 ppm; MgSO 4= 30 ppm;
CaCl2= 27.75 ppm

e
What are organometallic compounds? How Grignard reagents are prepared? Write any five applications of Grignard reagents