SPPU First Year Engineering (Semester 1)
Engineering Chemistry
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Solve any one question from Q1 and Q2
1 (a) Discuss the Ion-Exchange method for softening of hard water with the help of reactions involved in removal of ions and regeneration of the exchangers. Draw a neat labelled diagram and give limitations of the process.
6 M
1 (b) Define the following terms:
i) Bathochromic shift
ii) Hypochromic shift
ii) Chromophore.
3 M
1 (c) Explain the conductometric titration curve for the reaction between KCI and AgNO3.
3 M

2 (a) Explain the potentiometric titration of Fe2+ against Ce4+ giving reactions. Draw the titration curve and give the formulae for calculating emf of the cell at various stages of the titration.
6 M
2 (b) Give the demerits of the traditional route and merits of the green route of synthesis of polycarbonate.
3 M
2 (c) 50 ml of water sample required 12.1 ml of N/50 HCI to reach the phenolphthalein end-point and 18.5 ml of the same acid for the methyl orange end-point. Calculate types and amount of alkalinities present.
3 M

Solve any one question from Q3 and Q4
3 (a) Define glass transition temperature. Give its significance and discuss any four factors affecting it.
6 M
3 (b) Define GVC and NCV. Give the justification of how they are related.
3 M
3 (c) A coal sample has the following composition:
C=70%, H=10%, N=3%, S=3%, O=2% and ash=12%. If 20% excess air is required for complete combustion, then calculate the amount of air required for complete combustion of 1 kg of coal.
3 M

4 (a) Explain in brief the process of fractional distillation of petroleum with diagram. Give the composition and boiling range of petrol and diesel obtained.
6 M
4 (b) Give the purpose and examples of the following constituents used during the compounding of plastics:
i) Fillers
ii) Lubricants
iii) Plasticisers.
3 M
4 (c) Explain solution polymerisation techniques. Draw the figure and state the disadvantages of this technique.
3 M

Solve any one question from Q5 and Q6
5 (a) Explain the structure of fullerene. Give any two properties and two applications of fullerene.
5 M
5 (b) Give the preparation reaction and applications of germane and lithium hydride.
4 M
5 (c) Discuss the properties of hydrogen which make it difficult for storage.
4 M

6 (a) Explain the production of hydrogen by water splitting using solar energy.
5 M
6 (b) Discuss the different types of carbon nano tubes with respect to their structure. Give any two applications of it.
4 M
6 (c) Explain the structure of graphite. Give its properties and applications.
4 M

Solve any one question from Q7 and Q8
7 (a) Give the Pilling-Bedworth ratio and its significance. Give the oxidation reaction involved and state the type of film formed on the surface in the case of Mg. Cr and Mo.
5 M
7 (b) Explain the process of galvanising With labelled diagram. Give the applications and limitations of this technique.
4 M
7 (c) State the different types of corrosion inhibitors With their examples. Discuss in brief their role in corrosion Prevention.
4 M

8 (a) Discuss any five factors affecting corrosion.
5 M
8 (b) Define corrosion. Explain the hydrogen evolution mechanism of wet corrosion.
4 M
8 (c) What is the principle of cathodic protection? Discuss any one technique of cathodic protection and give its Applications.
4 M



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