Engineering FE Engineering Common Sem 2 May 2023 2023 FE2Engineering Chemistry II Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 Question No.1 is compulsory
2. Q2 Attempt any Three Questions from the remaining Five Questions
3. Q3 Figures to the right indicate full marks Attempt any Five of the following: (15)
   • a. Give the principle of cathodic protection? What are the two types of cathodic
   • b. Define Spectroscopy and Electromagnetic spectrum
   • c. A cell is constructed from Ni Ni** and half cells. Given = - 0.257 V and = 0.337 V. Find out the standard potential of the cell
   • d. How does position of metal in galvanic series affect corrosion
   • e. Explain ‘Prevention of waste’ principle in green chemistry
   • f. What are fuels? Give the characteristics of good fuel
   • g. of coal has the following composition by mass: C = 85%, H = 6%, O = 8%, S = 0.5% and Ash = 0.5%. Calculate HCV using
4. Q2 a. What is Electrochemical corrosion? Explain Hydrogen evolution mechanism with the help of Diagram. (6)
   • b. Define Green chemistry. Calculate the % atom economy for the following synthesis process of propene. (5)
   • c. What is knocking. Explain the role of anti-knocking agents. 4
5. Q3 a. What is oxidation corrosion. Name the different types of oxide layer formed and state which oxide layers are non-protective in nature. Explain with suitable examples. (6)
   • b. 3.2 gm of coal in Kjeldahl’s experiment evolved NH3 gas was absorbed in 40 ml of 0.5 N After absorption the excess acid required 16 ml of 0.5N NaOH for complete neutralization. 2.5 gmsof coal sample in quantitative analysis gave 0.42 gm BaSO4 Calculate the % N and S. (5)
   • c. What is Electrochemistry? Differentiate between Electrolytic cell and
6. Q4 a. Calculate the weight of air required for complete combustion of 1Kg coal containing C=65%, H=4% , S=2%, N=4%, moisture=10% and remaining ash. (6)
   • b. Give conventional and green chemistry route of production of Indigo. Highlight the green chemistry principles in this case. (5)
   • c. How is the rate of corrosion influenced by:
   • (i) pH of the medium
   • (ii) Relative areas of cathode and anode parts. 4
7. Q5 a. Give in tabular form the relation between electromagnetic spectrum, types of spectroscopy and corresponding energy changes. (6)
   • b. Explain trans-esterification method for synthesis of bio- diesel. Mention advantages of
   • c. What are metallic coatings? Distinguish between galvanizing and tinning. 4
8. Q6 a. What are reference electrodes? Give construction and working of any one secondary
   • b. What is meant by knocking in internal combustion engine? Define octane number and name any two anti-knock agents. (5)
   • c. What are selection rules? Explain any two selection rules. 4

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