CHEMISTRY 1st year

UTTARAKHAND TECH. UNIVERSITY

UTU

B.TECH FIRST YEAR, 2012

SUB :- cHEMISTRY

time : 3hr] 

Total marks :100

SECTION A

Q1:- Attempt any four of the following :

1. Draw the MO diagram of HF molecule and calculate its bond order.
2. Derive Bragg's equation for diffraction of X-rays by crystal.
3. Write mechanism of :
   (i) Cannizzaro Reaction
   (ii) Beckmann's rearrangement.
4. By using appropriate examples, discuss and illustrate the stereo chemical implications of SN¹ and SN² reaction.
5. (i) Differentiate between Enantiomers  and Diasteromers by using suitable example.(ii) Differentiate  between Nematic and smectic liquid crystal.
6. Explain why :
   (i) Ice floats on water.
   (ii) Addition of HBr to propene-1 does not follow Markownikoffl s rule in presence of peroxide.

SECTION B

Q2:- Attempt any four of the following :

1. A completely exhausted zeolite softner requires 120 liters of NaCl solution having hardness 500 ppm can be softened by the zeolite.
2. What would be the pH of a solution obtained by mixing 5 gm of acetic acid and 75 gm of sodium acetate and making the volume equal to 500 ml? Dissociation constant of acetic acid at 25^oC is 1.75 x 10^-5.
3. Define order of a reaction. Prove that, if the concentration of one of the species in a second order reaction (A + B →C) is taken in excess the reaction behaves like a first order.
4. Write a note on:
   (i) Calgon conditioning
   (ii) Liquid junction Potential.
5. Explain the mechanism of hydrogen evolution and oxygen absorption theory in electrochemical corrosion.
6.  (i) The solubility of silver chloride in water at 25^oC is 0.00179 gm/L. Calculate its solubility products at 25^oC .

SECTION C

Q3:- Attempt any two of the following :

1. (i) Define the terms refractory. How are they classified?
   (ii)  Describe in brief about conducting polymers.
2. (i) what do you mean by tacticity? Explain an isotactic, a syndiotactic and an atactic polymer.
   (ii) What are the monomers used for each of the following polymers? Give commercial application of each :
   (a) Nylon-6
   (b) Neoprene
   (c) Orlon
   (d) Bakelite
   (e) Natural Rubber.
3. Write notes on :
   (i) Nanocomposites.
   (ii) Ziegler-natta catalyst
   (iii) Vulcanisation
   (iv) Protective coating.

SECTION D

 Q4:- Attempt any two of the following :

1. Define gross calorific value and net calorific value of a fuel.
   
   The following data is obtained in a bomb calorimeter experiment:
   Weight of crucible = 3.50 gm, Weight of crucible + fuel = 4.65 gm, weight of water water taken = 2000 gm , Water equivalent of calorimeter = 550 gm, Observed rise in temp. = 0.02⁰C, fuse wire correction = 50 cal, Cotton thread correction = 1.5 cal.
   Calculate GCV and NCV of the fuel sample if the fuel contains 5.5% Hydrogen.
   
   
2. Define the term lubrication. Mention important functions of lubricants. Describe any five important properties of lubricants.
3. (i) Discuss the mechanism of boundary film lubrication.
   (ii) Write notes on:
   (a) Trans esterification
   (b) Bio Fuel.

SECTION E

Q5:- Attempt any two of the following :

1. (i) Define Complexometric titration. How is EDTA used in complexometric titraion.
   (ii) To 20 ml, of a copper solution, after necessary treatment, were added 2 gm of KI and the liberated iodine required 11.2 ml, of decinormal hypo solution for titration. Calculate the strength of copper per litre in the solution. [ At . Wt. of Cu = 63.5]
2. (i) Define the term Bathochromic shift and Hypsorchromic shift with suitable examples.
   (ii) Suggest a structure for an organic compound (Molecular formula = C₉H₁₂) consistent with the following NMR data:
   (a) Singlet at δ 7.1 (3H)
   (b) Singlet at  δ 2.25 (9H)
3. (i) Calculate the λ_max for the following using Woodward-Fieser rule:
   (a)
   
   (b)
   
   (ii)   Explain the terms Molecular ion peak and Base peak in the mass spectroscopy. A liquid compound gave a mass spectrum showing a strong molecular ion at m/z =156. The only fragment ions are seen at m/z = 127 and 29. Suggest a structure for this compound.

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