Roll Number:
Thapar Institute of Engineering and Technology
School of Chemistry and Biochemistry
End Semester Test (February 2021)
Class: B.E. 1st Year, 1st Semester Subject: UCB008, Applied Chemistry
Time: 2 Hours, M. Marks:50 Name of Faculty: SM, SNS, MRP, MNC, DAV, PV
1. Attempt any FIVE questions. All questions carry equal marks.
2. Write your tutorial group on the top right corner of the answer sheet.
will be given.
3. Attempt all parts of a question at one place otherwise,no marks
4. Be brief' and to the point to save time
5. Use structures and diagrams wherever necessary to get full credit.
(a) What is the role of atomizer and nebulizer in atomic spectroscopy? What is role of the 2,3
1.
gas filled in hollow cathode lamp for the generation of electromagnetic radiations?
5
(b) Draw a schematic well labelled diagram of the APS.
2,3
2. (a) (i) Draw all possible electronic transitions in organic molecules.
(ii) 1,3-Butadiene absorbs at longer wavelength as compared to ethylene. Explain
with the help of an energy level diagram.
(b) In an absorption cell, the transmittance of a 0.1 M solution of a substance X is 60% and 5
that of 0.1M solution of another substance Y is 40% at a given wavelength. What is the
transmittance of a solution that is simultaneously 0,1 M in X and 0.1 M in Y?
3. (a) Write Phase Rule equation. Define (i) Phase (ii) Degree of freedom in the context of 1,2,2
phase rule with one example of each.
(b) Solution of lead having 2.6% silver at 400°C is cooled to room temperature. Describe the 5
sequence of events occurring by using phase diagram of the Lead-silver system.
2, 3
4. (a) (i) Name FOUR different categories of copolymers.
(ii) In a polymerization reaction, 52 g of vinyl chloride was utilized. The average
degree of polymerization for the PVC produced was found to be 2.1x 107.
Calculate the number of molecules of PVC produced. (Mol. Wt, of vinyl chloride
= 62.50)
5
(b) Explain the mechanism of conduction in n-doped polyacetylene chain.
(a) Calculate the temporary and permanent hardness of a water sample having following 5
5.
dtialy I CIJVI 1.•
Mol. wt. Conc. Salt Mol. wt. Conc.
Salt
4.05 ppm Mg(HCO3)2 146 14.6 ppm
Ca(HCO3)2 162
6.80 ppm MgSO4 120 8.40 ppm
CaSO4 136
8.5 ppm KCI 74.5 12.5 ppm
NaHCO3 84
5
(b) Write the chemical reaction of hard water containing Ca504 and MgCl2 when passed
through a zeolite bed. Give any two drawbacks of hardness removal by zeolite
treatment.
P.T.O.
6. (a) State three main advantages of the conductometric titrations. Graphically discuss the 2,3
variation of conductance when acetic acid (in beaker) is titrated against NaOH (in
burette).
(b) What is the effect of dilution on specific conductance of acetic acid and hydrochloric 3,2
acid? Calculate the specific conductance of 0.047 molar NaOH if the resistance offered
and the cell constant are 60.2 ohm and 89.6 m -1 respectively.
7. (a) Compare the hot lime soda process with the cold lime soda process giving at least four 5
points.
(b) What is the essential condition for a compound to be IR active? 1,2,2
How will you distinguish the following based on IR spectroscopy?
(i) Primary amine from the secondary amine
(ii) Ester from ketone on the basis of C=0 stretching
*****************
