Applied Chemistry 1 - May 2013

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

1 (a) Different between BOD and COD.(3 marks) 1 (b) What are natural rubbers? What are their drawbacks?(3 marks) 1 (c) Define grease. Under which situation it is used as a lubricant.(3 marks) 1 (d) Define phase, component and degree of freedom.(3 marks) 1 (e) Write composition of portland cement.(3 marks) 1 (f) What are plasticizer and give its functions ?(3 marks) 1 (g) What is the total hardness of sample of water has the following impurities in mg/I.
Ca(HCO₃)₂ = 162 CaCI₂ = 22.2
MgCI₂ = 95 NaCI = 20(3 marks) 2 (a) 0.5g of CaCO₃ was dissolved in dilute HCI and diluted to 500 ml, 50 ml of this solution required 45 ml of EDTA solution for titration. 50 ml of hard water sample required 15 ml of EDTA solution for titration. 50 ml of same water on boiling, filtering requires 10 ml of EDTA solution. Calculation the temporary permenant and total hardness in ppm.(6 marks) 2 (b) Draw and explain the phase diagram of ice-water-water vapour system.(5 marks) 2 (c) Explain CVD method for preparation of carbonnanotubes.(4 marks) 3 (a) What are solid lubricants explain with two examples.(6 marks) 3 (b) Explain fabrication of plastic with examples of injection molding. (5 marks) 3 (c) Give limitations of phase rule.(4 marks) 4 (a) Write preparation, properties and uses of following polymers :-
(i) Buna S
(ii) Kevlar
(6 marks) 4 (b) Explain demineralization of water by ion exchange method.(5 marks) 4 (c) 2.5 g of vegetable oil was mixed with 50ml of KOH solution and heated for 1 hour. The mixture required 26.4 ml of 0-4 N HCI. The blank titration reading was 49-0 ml. Find the saponification value of oil.(4 marks) 5 (a) Write preparation properties and uses of -
(i) Dolomite bricks
(ii) Silicon carbide
(6 marks) 5 (b) Explain effect of heat on polymer and factor affecting it.(5 marks) 5 (c) A zeolite softner was complete exhausted and was regenerated by passing 150 lit of NaCI solution, containing 50 g/litre of sodium chloride. How may litres of water sample of hardness 450 ppm can be softness by zeolite container.(4 marks) 6 (a) With the help of chemical equations explain the principle of lime soda process. (6 marks) 6 (b) Write short notes on :-
(i) Conducting polyers
(ii) Polymers in medicline an surgery.(5 marks) 6 (c) Explain the following properties and discuss its significance Viscosity and Viscosity index. (4 marks)