UPTU Previous Year Question Papers B Tech 2nd Semester Chemistry 2006-07

UPTU Previous Year Question Papers

B Tech 2nd Semester Chemistry 2006-07

 

Note : (1) Attempt all the questions.

(2) In case of numerical problems, assume data wherever not provided.

 1. Attempt any two parts of the following

(a) With the help of molecular orbital diagram arrange the following molecule/ion in order of their increasing bond length. o2 o2 o2

(b) What is meant by Intermolecular and Intramo­lecular H-bonding ? Explain the consequences of H-bonding.

(c) Explain the structure of graphite. Also explain the reasons for its electrical and lubricating properties.

OR

Explain crystal field theory for octahedral compounds, giving suitable example.

 

2. Attempt any four parts of the following :

(a) Give the structure consistent with the following NMR data :

C3H5C13 – a Singlet, 8 2.20, 3H

b Singlet, 8 4.20, 2H

(b) Define the terms chromophore and auxochrome, in UV spectroscopy

(c) Explain vulcanisation and state the improve­ment in properties of rubber after vulcanisation is carried out.

(d) Write the structures (only) of the following polymer :

(i) Polyacrylonitrile

(ii) Buna-S

(iii) Dacron

(iv) Nylon-6.

(e) Give the mechanism of addition and condensation polymerisation.

(f)  Explain the different modes of vibration in a poly atomic molecule.

 

3.  Attempt any two parts of the following :

(a) Explain the mechanism of nucleophilic substitution reactions.

(b) Give the mechanism of following reactions :

(i) Hofmann rearrangement

(ii) Aldol condensation

(iii) Canizzaro reaction.

(c) What is optical activity? Give the stereoisomers of Tartaric acid ? How do you account for lack of optical activity in meso-forms and racemic mixtures.

 

4. Attempt any four parts of the following

(a) The rate constant of a reaction is 1.5 x 107 sec-1 at 50°C and 4.5xl07 at 100°C. Evaluate the Arrhenius parameters A and Ea.

(b) Derive the equation for half life of first order reaction.

(c) With the help of phase diagram of water, calculate the degree of freedom at triple point.

(d) Explain four methods for prevention of corrosion.

(e) Derive Nernst’s equation for single electrode potential and explain the terms involved in it.

(f)  Write short note on Galvanic cell.

OR

Write short note on solar energy.

 

5.  Answer any four of the following

(a) Explain the zeolite method for softening of water.

(b) A water sample contains 408 mg of CaS04 per litre. Calculate the hardness in terms of CaC03 equivalent.

(c) The following data were obtained in a bomb calorimeter experiment :

Weight of coal = 0.85 gm, weight of water taken = 750 gm

Water equivalent of Calorimeter = 2000 gm

Rise in temp. = 0.30°C,

Acid correction = 0.03°C

If the sample contains 10% H, calculate net and gross calorific value.

(d) Give the composition of Biogas. With the help of a diagram, explain a bio-gas plant.

(e) Write short notes on Acid rain and formation and depletion of ozone.

(f)  What is pollution ? Give two air pollutants and their effect on human life.

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