Roll No. ,'''''.''''''.''''..''.
Total No. of Questions ':09]
[Total No. of Pages: 02
B~Tech., (Sem. - 1st I 2nd) ENGINEERING CHEMISTRY
~ SUB.TECT [Note:
CODE: CH.- 101 (2K~ Paper ID : [AOl12] Please
code and paper
& ONWARDS) ID on OMR]
Time: 03 Hours Instruction to Candidates: 1) 2) 3)
Section - Ais Compulsory. Attempt any Five questions from Section - B & C. Select at least Two questiops from Section - B & C. Section - A (Marks: 2 Each)
Why should water be softened before use-in boilers?
How water is softened by Ion exchangers.
Selection rules for fR.
e.m.f. and potential of cell. '
Why metals corrode faster near s~ashores?
What is the effect of pressure on melting point of ice?
Difference between a photochemical and photosensitized reactions:
Capillary column Vs wide bore column.
Is Ca - EDTA complex soluble in water.
Method of prevent~on of caustic embrittlement.
Section - B
(Marks: 8 Each) Q2) (a)
What are the requirements for the boi.ler'feed water? What happens if we use hard water in boilers?
What are zeolites? Explain method of removing hardness with zeolite with mechanism.
Distinguish between chemical and electrochemical corrosion.
Explain cathodic 1>rotection. Mention its two applications?
Q4) Describe working principle of HPLC. What are different kinds of columns used in chromatography? Describe material used an~ specifications.
. Q5) (a)
Calculate the emf of the following concentration cell.
Agi Ag+ O)M
Agi Ag+ 1.OM
(b) Write a note on reference electrode. Section. C (Marks: 8 Each) Q6) What modes of vibrations are active in IR absorption spec tors and why? Taking nitro group as an example show the various types of vibrations which will be observed in IR spectra. Q7) (a)
Give brief account on significance of the chemical shift in NMR.
Why TMS is taken as an standard for measuring chemical shift? Can we take tetra ethyl silane as a standard?
How is the study ofAg-Pb system phase. diagram desil verization of argentiferous lead?
useful in the
(b) Explain UCST (Uppe~ Critical Solution Temperature) and LCST (Lower Critical Solution Temperature) witb the help of suitable example. Q9) (a) Explain kinetic.s of decomposition of HI. (b) Calculate the number of moles of HCI(g) produced by absorption of one. Joules of radiant Energy of wave length 480 nm in the reaction H2(g) + CI/g) -t 2HCI(g) if the quantum yield of the photochemical reaction is 1.0 x 106.