Question Paper: Engineering Chemistry 2 : Question Paper Dec 2012 - First Year Engineering (Semester 2) | Anna University (AU)
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## Engineering Chemistry 2 - Dec 2012

### First Year Engineering (Semester 2)

TOTAL MARKS:
TOTAL TIME: HOURS

1 What is a Galvanic cell?(2 marks) 10 What is the principle of estimation of iron by colorimetry?(2 marks)

### Answer any one question from Q11 (a) & Q11 (b)

11 (a) (i) Derive Nernst equation for the calculation fo cell emf. Give its applications.(8 marks) 11 (a) (ii) Explain the measurement of pH of a solution Using glass electrode. Mention the advantage of this electrode.(8 marks) 11 (b) (i) What is electrochemical (or) EMF series? Give its applications with suitable examples.(8 marks) 11 (b) (ii) Explain the principle involved in potentiometric titrations. Write an experimental procedure for carrying out the titration of a precipitation reaction.(8 marks)

### Answer any one question from Q12 (a) & Q12 (b)

12 (a) (i) When does the electrochemical corrosion occur? Describe the mechanism of electrochemical corrosion.(8 marks) 12 (a) (ii) Write a brief note on cathodic protection methods.(8 marks) 12 (b) (i) With reference to control of corrosion rate, explain (1) anodic inhibitors and (2) cathodic inhibitors.(6 marks) 12 (b) (ii) How will you distinguish between electroplating and electroless Plating? Write a detailed account on the activation of surface, overall reaction, electroless Platting and favourable conditions of Nickel.(10 marks)

### Answer any one question from Q13 (a) & Q13 (b)

13 (a) (i) Explain the ultimate analysis of coal.(6 marks) 13 (a) (ii) Describe the Otto-Haffmann method of coke manufacture and the recovery of various by products.(10 marks) 13 (b) (i) A coal sample was found to contain the following: C=81%, H=4%, O=2%, N=1% and the remaining being ash. Estimate the quantity of minimum air required for the complete combustion of 1 kg of coal sample, if 40% of excess air is required.(6 marks) 13 (b) (ii) How is flue gas analysis carried out by Orsat's apparatus? Mention also the significance of such analysis.(10 marks)

### Answer any one question from Q14 (a) & Q14 (b)

14 (a) (i) What is the difference between critical point and triple Point? 100 kg of a sample of argentiferrous lead containing 0.5% Ag is melted and then allowed to cool. If eutectic contains 2.6% Ag.
(1) What mass of eutectic will be formed and
(2) What mass of lead will separate out?
(6 marks)
14 (a) (ii) Discuss the Pb-Ag system with a complete phase diagram.(10 marks) 14 (b) (i) Mention two non-ferrous alloys. Give their composition and uses.(6 marks) 14 (b) (ii) Name five different alloy steels and briefly explain their applications.(10 marks)

### Answer any one question from Q15 (a) & Q15 (b)

15 (a) (i) Describe the various components of colorimeter and its working in detail.(8 marks) 15 (a) (ii) Explain any four applications of IR spectroscopy with suitable examples.(8 marks) 15 (b) (i) With a neat diagram explain the principle, instrumentation and working of atomic absorption spectroscope. How will you estimate the amount of nickel using atomic absorption spectroscopy?(10 marks) 15 (b) (ii) Describe the steps involved in the determination of sodium ion concentration in a given sample solution using flame photometer.(6 marks) 2 Draw a representative plot of conductometric titration of a strong acid versus strong base.(2 marks) 3 List out the differences (any four) between chemical corrosion and electrochemical corrosion.(2 marks) 4 What are vapour phase inhibitors?(2 marks) 5 What is the difference between caking coal and coking coal?(2 marks) 6 What is the composition of producer gar? What is its calorific value?(2 marks) 7 How many phase and components are present in the following system? $$CaCO_{3(s)} \leftrightharpoons CaO_{(s)} + CO_{2(g)}$$(2 marks) 8 What do you understand by heat treatment of stainless steel?(2 marks) 9 What is finger print region in JR spectroscopy? Mention its important use.(2 marks)