Applied Chemistry 1 - Dec 2014

First Year Engineering (Semester 1)

TOTAL MARKS: 60
TOTAL TIME: 2 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Use suitable data wherever required.
(4) Figures to the right indicate full marks.

Solve any five of the following.

1(a) Define cloud point and pour point. Discuss its significance.(3 marks) 1(b) Explain the principle of EDTA method.(3 marks) 1(c) Dishtinguish between thermoplastic and thermosetting resins.(3 marks) 1(d) Write a brief note on CNT's(3 marks) 1(e) Explain the reduced Phase rule.(3 marks) 1(f) Explain the role of plasticizers and lubricants in the compounding of plastics.(3 marks) 1(g) 25 ml of sewage water is refluxed with 0.1N K₂Cr₂O₇ solution in presence of H₂SO₄ and Ag₂SO₄. The unreacted dichromate required 5.5ml of 0.1N FAS solution. Blank titration consumed 15ml of 0.1N FAS solution. Calculate COD of the effluent in mg/lit.(3 marks) 2(a) Calculate the amount of lime (85% pure) and soda (95% pure) required to soften one million liters of water which contains:
MgCO₃=8.4 ppm, CaCl₂=22.2 ppm, MgCl₂₌9.5 ppm, CO₂=33 ppm, HCl=7.3 ppm, KCl=16.8 ppm.(6 marks) 2(b) Explain the two component, Pb-Ag system with an appropriate phase diagram.(5 marks)

Write the preparation and uses of (Any one)

2(c) (i) Dolomite Bricks(4 marks) 2(c) (ii) Silicon Carbide bricks(4 marks) 3(a) What are the conditions for the use of solid lubricants? Explain the structure and uses of graphite.(6 marks) 3(b) What is vulcanization? Explain with proper reaction. Mention the advantages of vulcanized process. (5 marks) 3(c) Explain the following terms giving two suitable examples. (i) Phase (ii) Component.(2 marks)

Give the preparation, properties and uses of (any two)

4(a)(i) PMMA(3 marks) 4(a)(ii) Kevlar(3 marks) 4(a)(iii) Buna-S rubber(3 marks) 4(b) Explain the zeolite method for softening of water including the folloing points. Diagrams, process with reaction, regenration with reactions.(5 marks) 4(c) 2.5g of vegetable oil was mixed with excess of KOH solution and heated with reflux condenser. The mixture required 16.5 ml of 0.5N HCl. The blank titration reading was 40.1ml of same HCl Find saponification value of oil.(4 marks)

Write short notes on (any one)

5(a)(i) Decay of concrete and its prevention.(6 marks) 5(a)(ii) Setting and hardening of cement.(6 marks) 5(b) What is fabrication of plastics? Explain the injection moulding method with the help of neat diagram.(5 marks) 5(c) The hardness of 10,000 liter of hard water sample was completely removed by passing it through a zeolite softener. The zeolite softener required 5000 litre of NaCl solution containing 1170mg of NaCl/litre. Determine the hardness of water sample. (4 marks)

Discuss the following treatment methods for municipal water (any two)

6(a)(i) Bleaching powder(3 marks) 6(a)(ii) Ozone(3 marks) 6(a)(iii) Chlorine(3 marks)

Discuss any two of the following.

6(b)(i) Glass transition temperature(2 marks) 6(b)(ii) Polymers in medicine and surgery(2 marks) 6(b)(iii) Conducting polymers(2 marks) 6(c) Write a note on blended oils. (Any four additives)(5 marks)