Engineering FE Engineering Common Sem 2 December 2022 2022 Engineering Chemistry II Question Paper - Mumbai University | munotes
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Questions asked in this paper
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Q1 Question No.1 is compulsory
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Q2 Attempt any Three Questions from the remaining Five Questions
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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
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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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