Engineering Chemistry - Dec 2014

First Year Engineering (C Cycle) (Semester 2)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) Derive Nernst's equation for single electrode potential.(5 marks) 1 (b) Describe the construction and working of calomel eletrode.(5 marks) 1 (c) What are batteries? Explain the following battery characteristics:
i) Capacity ii) Cycle life(5 marks) 1 (d) Describe the construction and working of nickel metal hydride battery.(5 marks) 10 (a) Define COD, calculate the COD of the effluent sample when 25 cm³ of the effluent sample requires 8.5 cm² of 0.001 NK₂Cr₂O₂ solution for complete oxidation.(5 marks) 10 (b) Discuss in detail the softening of water by ion-exchange process.(5 marks) 10 (c) Explain the synthesis of nanomaterials by hydro thermal process.(5 marks) 10 (d) What are Fullereces? Explain the synthesis and uses of fullerenes.(5 marks) 2 (a) What are Reference electrode? Explain the determination of electrode potential of an unknown electrode using calomel electrode.(5 marks) 2 (b) What are concentration cells? The emf of the cell Ag |AgN(), (0.0083M)| AgNO₃(x M) Ag was found to be 0.074V at 298 K. Calculate the value of x and write cell reaction.(5 marks) 2 (c) Define fuel cell. Explain the construction and working of methanol oxygen fuel cell.(5 marks) 2 (d) Explain the construction and working of lithium ion battery.(5 marks) 3 (a) Explain the electrochemical theory of corrosion by taking iron as an example.(5 marks) 3 (b) What is Corrosion? Explain the following factors affecting the rate of corrosion:
i) Nature of corrosion product
ii) Anodic and Cathodic areas.(5 marks) 3 (c) What is Electro less platting? Write the difference between electroplating and electroless platting.(5 marks) 3 (d) Discuss the electroplatting of gold using Acidic Cyanide bath.(5 marks) 4 (a) What is Anodising? Explain the anodizing of aluminium.(5 marks) 4 (b) What is Cathodic protection? Explain sacrificial anodic method and impressed current method.(5 marks) 4 (c) Explain the effect of any two factors on the nature of electro deposite.(5 marks) 4 (d) Explain the process of electroless platting of copper with relevant reactions.(5 marks) 5 (a) What is Cracking? Explain the fluidized catalytic cracking process.(5 marks) 5 (b) On burning 0.76 × 10^-3 kg of a solid fuel in a bomb calorimeter, the temperature and latent heat of steam are 0.486kg and 2457 kJ/kg respectively. Calculate its GCV and NCV. Give Sp Heat=4.187 kJ/kg/ °C and % H₂ is 2.5.(5 marks) 5 (c) Discuss the production of solar grade silicon by Union-Carbide process.(5 marks) 5 (d) What are the advantages and disadvantages of PV cells?(5 marks) 6 (a) Explain the determination of calorific value of a solid fuel using bomb calorimeter.(5 marks) 6 (b) Define the following terms:
i) Chemical fuel
ii) Calorific value
iii) Biodiesel
iv) Octane number
v) Reforming of petrol.(5 marks) 6 (c) Discuss the construction and working of a PV-cell.(5 marks) 6 (d) What is doping? Discuss the purification of silicon of zone-reining.(5 marks) 7 (a) Explain the free radical mechanism of addition polymerization by taking Vinyl chloride as a monomer.(5 marks) 7 (b) What are adhesives? Explain the synthesis and applications of epoxy resin.(5 marks) 7 (c) Write the synthesis and applications of the following polymers:
i) Polymethyl methacrylate ii) Teflon(5 marks) 7 (d) What are polymer composites? Explain the preparation and uses of Kevlar fiber.(5 marks) 8 (a) Calculate the number average and weight average molecular mass of a polymer with the following composition: $$ \begin{bmatrix} &\alpha \\ -CH_2&-CH \end{bmatrix}_{200} \ is \ 40\%; \\\begin{bmatrix} &\alpha \\-CH_2 &CH- \end{bmatrix}_{400} \ is \ 30\%; \\\begin{bmatrix} &\alpha \\-CH_2 &-CH - \end{bmatrix}_{500} \ is \ 30\% . $$ Given At. Wt. of C-12, Atomic weight of H=1; and Atomic weight of CL=35.5(5 marks) 8 (b) What is glass transition temperature? How is it affected by
i) Intermolecular forces
ii) Flexibility(5 marks) 8 (c) What is Conducting polymer? Explain the mechanism of conduction in polyaniline.(5 marks) 8 (d) Give the synthesis and uses of the following polymers:
i) Silicon rubber
ii) Polycarbonates.(5 marks) 9 (a) What is boiler feed water? Explain the scale and sludge formation in boiler. Mention their ill effects.(5 marks) 9 (b) What is desalination? Explain the desalination of saline water by electro dialysis.(5 marks) 9 (c) What are nano materials? Explain the synthesis of nano material by Sol gel method.(5 marks) 9 (d) Write a note on carbon nano tubes.(5 marks)