Roll No. ......................

'>,:otalNo.ofQuestions: 09] Paper r7 -

ID

[CMIOl]

[TotalNo.ofPages: 03

(please till this Paper In in OMR Sheet)

B. Tech. (Semester - 1st & 2nd) CHEMISTRY (CHM 101)

-

Time: 03 Hours

Maximum Marks: 60

Instruction to Candidates: 1) 2)

Section - A is compulsory.

3)

Select at least Two questions from Section - B & C.

.

Attempt any Five questions from Section - B & C.

Section - A

.

[Marks: 2 Each]

Ql) a) What is the significance of break-point chlorination? b) Why is methanol a good solvent for UV but not for IR determination? c) Pyridine and ammonia are bases while they do not contain any hydroxyl ion. Explain. d) Define the terms: Photosensitization and quenching. e) Distinguish between EMF and electrode potential. f)

Why does magnesium bicarbonate require double amount of lime for softening? ,

g) How many signals are observed in the NMR spectrum of chlorobenzene, acetaldehyde, ethanol and benzene? h) Write the cell reaction for the cell: Na(s)1 NaOH(aq)

i)

j)

.

I IHz (g)J Pt

Why qoes corrosion occur in steel pipe connected to copper plumbing?

What are degrees of freedom? How many degrees of freedom are present in the system when a gas is in equilibrium with its solution in a liquid?

Section Q2)

-

B

[Marks: 8 Each]

(a) Describe the hot lime-soda process for the softening of water. Mention its advantages over cold iime-soda process. -------.. (b) What is desalination? What are the methods available for desalination? Discuss anyone process in details.

Q3)

(a) Describe the mechanjsm of electrochemical corrosion by (i) hydrogen evolution (ii) oxygen absorption. .

(b) What is Pillilfg-Bedworth ratio? How is it related to the protectiveness of an oxide layer? (c) Give a brief account of cathodic protection method for preventing corrOSIon. Q4)

(a) Account for the following:

(i)

Ammonium chloride is used before precipitating group III cations in inorganic analysis.

(ii) An aqueous solution of sodium acetate is.basic. (b) At 298 K, calculate the pH of a 0.23 M weak monobasic acid having ionization constant 7.3 X 10-6. Q5)

(a) Calculate the emf of the cell: ,Zn(s)1 Zn2+ (0.2M)

II.Ag + (0.002M)

I Ag(s)

at 2SoC. Write down the cell reaction. The standard emf of the cell is l.S4V. (b) Describe the construction of Ni-Cd battery with relevant reactions occurring during the discharge: Mention its application.

Section - C Q6)

~

[Marks: 8 Each]

(a) State and explain Einstein law of photochemical equivalence. What is meant by quantum yield of a photochemical reaction? (b) For the photochemical formation of ethylene from d~-n-propyl ketone . using a radiation of wavelength 313 nm the quantum yield is 0.2l. Calculate the number of moles of ethylene formed when the sample is irradiated with SOwatt of this radiation assuming that all the radiation is absorbed by the sample.

,127) ~.'

(a) Define the following: (i) Eutectic point (ii) Triple point (b) State and derive Phase rule. What is reduced phase rule? Draw and explain phase diagram of KI-H20 system.

Q8)

(a) Three isomeric ethers are possible with the molecular formula C4HlOO. State how many signals will arise in the CarbOli-I3 NMR spectrum of each. Give explanation to your answer. .

(b) Explain the application of NMR spectroscopy to the following: (i)

Hydrogen bonding.

(ii) Structural diagnosis of keto-enol tautomers. Q9)

(a) Justify the following statements: (i)

Absorption bands are formed in ultra-violet spectrum instead of sharp peaks.

(ii) Increasing the polarity of the solvent shifts 1[-71[* band tb longer wavelength but n -7 1[* to shorter wavelengths. (iii) Wavelength as well as extinction-coefficient increase in conjugation in the compound.

increases with the

(b) Define Frank-Condon principle and' give its importance in molecular spectroscopy.

GNDEC B.Tech CHM 1st Year Dec 2007 Chemistry.pdf

(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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