Engineering FE Engineering Common Sem 2 Engineering Chemistry II Dec 2022 Question Paper - Mumbai University | munotes

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Older exam 2022 - Summer Semester-end · Engineering Chemistry II → Newer exam May 2023 - R19 Semester-end · Engineering Chemistry II →

Questions asked in this paper

Q1 Question No.1 is compulsory
Q2 Attempt any Three Questions from the remaining Five Questions
Q3 Figures to the right indicate full marks Attempt any Five of the following: 15
- a. What are fuels? Give characteristics of good fuel
- b. How does position of metal in galvanic series affect corrosion
- c. Explain ‘Prevention of waste’ principle in green chemistry
- d. Define Spectroscopy and Electromagnetic spectrum
- e. Give the principle of cathodic protection. What are the two types of
- f. A cell is constructed from Ni and /Cu half cells. Given = - 0.257 V and = 0.337 V. Find out the standard potential of the cell
- g. of coal has the following composition by mass: C = 85%, H = 6%, O = 8%, S = 0.5% and Ash = 0.5%. Calculate
Q2 a_ What is Electrochemical corrosion? Explain Hydrogen evolution mechanism with the help ofdiagram b Define Green Chemistry. Calculate the percentage atom economy for the 5 following reaction with respect to allyl chloride c What is knocking. Explain the role of anti-knocking agents. 4 is oxidation corrosion. Name the different types of oxide layer formed and 6 state which oxidelayers are non-protective in nature. Explain with suitable b 3.2 gm of coal in Kjeldahl’s experiment evolved NH; gas was absorbed in 40 ml of 5 0.5 N H2SO,.After absorption the excess acid required 16 ml of 0.5N NaOH for complete neutralization. 2.5 gms of coal sample in quantitative analysis gave 0.42 gm BaSO4. Calculate the % N and S c What is Electrochemistry? Differentiate between Electrolytic cell and 4 Proximate analysis consist of determinations of which contents in the coal. 6 Calculate the weight of air required for complete combustion of 1Kg coal b Explain conventional and green route method of manufacturing of Carbaryl. 5 By this method which principle of Green Chemistry is shown? c How is the rate of corrosion influenced by: 4 6 marks
- (i) pH of the medium Relative areas of cathode and anode parts in tabular form the relation between electromagnetic spectrum, types of 6 spectroscopy and corresponding energy changes b Explain trans-esterification method for synthesis of bio- diesel. Mention 5 advantages of Bio-diesel c What are metallic coatings? Distinguish between galvanizing and tinning. 4 What are reference electrodes? Give construction and working of any one 6 b (i) What is unleaded petrol? Give the advantages of oxygenates. 5 Define Octane and Cetane number, also give its significance c What are selection rules? Explain any two selection rules. 4

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