Time: 03 Hours Instruction to, Candidates: 1) 2) 3)
Maximum Marks: 60
Section - A is Compulsory. Attempt any Five questions from Section B & C. Select at least Two questions from . Section B & C. .
"'
Section - A Ql)
.
(10 x 2
= 20)
a)
Softening of water is essential, Explain.
b)
Differentiate between temporary and permanent hardness.
c)
What is pitting corrosion? Explain.
d)
Explain t.he oorroslon taking place in acidic medium.
e)
Drawthe phase-Diagram of water-system.
t)
Explain the laws of photochemistry. .
g)
Give anyone method for the prevention of corrosion.
h)
What is meant by standard electrode potential? Explain.
i)
Explain the NMR spectrum of acetone, methyl alcohol and benzene.
j)
Define chromophore and explain with examples. Section
I
.
-B (Marks: 8 Each)
Q2) What do you understand by cation and anion ~xchangers'?Explain the removal of hardness with ion exchange method. Q3) Give the mechanism of metal corrosion in slightly basic medium. Give some specific examples.
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Q4) Explain the Lowry-Bronsted and Lewis concept of acid and base. Whethe'-BF 3 and pyridine is acid or base, explain.
Q5) Write short notes on the following: (a) Cathodic protection. (b) Atmospheric Corrosion. Section - C
. .
(Marks: 8 Each)
Q6) Explain the Law of Photochemical equivalence. How quantum yield can be explained taking Law of Photochemical equivalence into consideration. Explain with some syecific examples.
Q7) What do youmean by chemical-shift? Explain with examples the shielding and deshielding effects of halogens in case of an alkane. Q8) Define Phase, component and degree of freedom. Discuss. Phase-Diagram for Liquid~SolidSystem.
.
Q9) Write short notes on the following: (a) Transitions involved in UV-Spectrophotometry. (b) Photoelectron Spectroscopy in case .of atoms and molecules.
Define chromophore and explainwith examples. Section - B. (Marks: 8 Each) ... Displaying GNDEC B.Tech CHM 1st Year May 2008 Chemistry.pdf. Page 1 of 2.
(b) What is desalination? What are the methods available for desalination? ... Q3) (a) Describe the mechanjsm of electrochemical corrosion by (i) hydrogen.
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