Question Paper: Engineering Chemistry : Question Paper Jun 2015 - First Year Engineering (Semester 1) | Pune University (PU)
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Engineering Chemistry - Jun 2015

First Year Engg (Semester 1)

TOTAL MARKS:
TOTAL TIME: HOURS


Answer any one question from Q1 and Q2

1 (a) What are 'Zeolites' ? Explain Zeolite process of softening of water. Give regeneration reactions, advantages and disadvantages of the process.(6 marks) 1 (b) Explain titration curve of conductometric titration in case of strong acid and weak base.(3 marks) 1 (c) Explain the following teRMS with suitable example:
(i) Chromophore
(ii) Auxochrome
(3 marks)
2 (a) Explain the pH metric titration of mixture of H3PO4 (phosphoric acid) and HCl (hydrochloric acid) against std. NaOH, giving chemical reactions, procedure, titration curve and calculations.(6 marks) 2 (b) Explain any three principles of Green Chemistry.(3 marks) 2 (c) 50 ml of water sample requires 18 ml of 0.05 MEDTA during titration. Whereas 50 ml of boiled water sample requires 12.5 ml of same EDTA in the titration. Calculate total, temporary and permanent hardness of water sample.(3 marks)


Answer any one question from Q3 and Q4

3 (a) What is vulcanization of rubber ? Explain chemical reaction involved in vulcanization process. Compare natural rubber with vulcanized rubber.(6 marks) 3 (b) Define:
i) Cetane number
ii) Power alcohol
iii) N.C.V.
(3 marks)
3 (c) Calculate carbon, hydrogen and sulphur percentage present in the coal sample from the following data:
(i) 0.15 gm coal sample on burning in combustion chamber in current of pure O2 was found to increase weight of CaCl2 U-tube by 0.08 gm. and KOH U-Tube by 0.49 gm.
(ii) 0.65 gm coal was combusted in Bomb calorimeter. Solution from bomb on treatment with BaCl2 solution, foRMS 0.031 gm BaSO4 dry precipitate.
(3 marks)
4 (a) What are fuel cells? Explain working of phosphoric acid fuel cell (PAFC) with figure and cell reactions. State its advantages.(6 marks) 4 (b) Explain with suitable diagram bulk polymerization technique to bring about addition polymerization.(3 marks) 4 (c) Give structure, properties and applications of polyphenylenevinylene (PPV).(3 marks)


Answer any one question from Q5 and Q6

5 (a) What are carbon nanotubes? Give types with respect to their structure. Give applications of CNT's.(5 marks) 5 (b) What are alanates? Explain how hydrogen gas is released from sodium alanates when used for hydrogen storage.(4 marks) 5 (c) Give structure, one method of preparation and applications of silane.(4 marks) 6 (a) Explain industrial production of hydrogen by steam reforming of methane and coke.(5 marks) 6 (b) Explain the isotopes of carbon with their applications.(4 marks) 6 (c) Explain structure of diamond based on bonding. Give its Applications(4 marks)


Answer any one question from Q7 and Q8

7 (a) What is dry corrosion ? Explain mechanism of oxidation corrosion with suitable figure and reactions.(5 marks) 7 (b) Explain how nature of metal affects the rate of corrosion.(4 marks) 7 (c) What are electroless coatings? Explain with suitable example. Give its application.(4 marks) 8 (a) Define corrosion. State the conditions under which wet corrosion occurs. Explain oxygen absorption mechanism of wet corrosion.(5 marks) 8 (b) Explain cementation and cladding methods of applying metallic coatings on base metal.(4 marks) 8 (c) Compare : Cathodic protection and Anodic protection.(4 marks)

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