Mumbai University Previous year question papers
I Year Examination Dec 2008
N.S. (1) Question No.1 is compulsory.
(2) From remaining six questions attempt any four.
(3) Figures to the right indicllte full marks.
(4) All questions carry equal marks.
1. Answer any five :-
(a) Can octane rating of a fuel be more than 100? Explain.
(b) What is Alclad? Why is it done?
(c) What are composite materials? Give their classification.
(d) Give the reaction of “Trans esterification”. Mention why is it required?
(e) List the characteristics of an ideal catalyst.
(f) 1.5 g of a sample of coal was taken for C and H estimation by combustion method. The increase in weights of tube containing,anhydrous CaC/2 and bulb containing KOHwas found to be 1.25 g and 4.88 g respectively. Calculate the percentageof’C and H.
(g) Calculate the percentage atom economy for the following reaction with respect to Allyl chloride.
CH3- CH = CH2 + CI2 —~ CI – CH2 – CH = CH2 + HCI Allyl chloride
(h) Three Faraday of electricity is passed through aqueous solution of AgN03′ NiS04′ CrGI3 kept in three vessels using inert electrodes. What is the ratio in moles in which the metals Ag, Ni, Cr will bedeposited?
2. (a) What is powder metallurgy? What are the steps involved in it? Mention the aim of each step. Give the advantages and disadvantages of powder metallurgy. (Two each).
(b) With a neat labeled diagram explain the anodic protection method.
(c) What mass of chlorine can be produced by the electrolysis of molten NaGI with a current of 1.2 A for 18 min. The electrode reaction is CI- —~ GI2 + 2e-.~
3.(a) What is cracking? Give the schematic diagram of moving bed catalytic cracking and mention the temperature, pressure, catalyst used and the quality of gasoline obtained by this method.
(b) What is catalysis? Give the various types with one example each.
(c) 1.95 g of a coal sample was taken for nitrogen estimation by Kjeldahl method. The ammonia liberated required 9.5 ml of 0.4N H2SO4for neutralization. The same sample of coal weighing 1.5 g in a Bomb calorimeter experiment produced 0.35 g of BaS04′ Calculate percentage of Nand S.
4. (a) Giving conventional and green chemistry route of production of Adipic acid, highlight the green chemistry principles addressed in this case.
(b) What are the necessary conditions for electrochemical corrosion? Give the mechanism of electrochemical corrosion in acidic medium with diagram and electrode reactions.
(c) With a suitable example explain application of green chemistry in waste utilization.
5. (a) Explain the adsorption theory of Catalysis.
(b) Explain in brief the various tests done under proximate analysis of coal giving the significance of each.
(c) A coal sample has the following composition by weight. C = 84 %, H = 6 %,S = 1 %, 0 = 8 % and remaining ash. Calculate the minimum quantity of air required both by weight and volume for the complete combustion of 2 kg of this fuel. (Mol. Wt. of air = 28.94).
6. (a) How does a catalyst affect the establishment of equilibrium state and activation energy of a reaction? Explain with necessary graphs.
(b) What are ceramic powders? Explain the method of manufacture of anyone ceramic powder.
(c) What are metallic coatings? Name the different ways of application of metallic . coatings~ Distinguish between anodic coating and cathodic coating.
7. (a) What are structural composites? Give their types and applications.
(b) Write short notes on :-
(i) Paints (Definition and most important two ingredients with their job and 2.5 example).
(ii) Commercial brass
(c) What are fibre reinforced composites? Explain their types.