Applied Chemistry 1 - May 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 :-

1 (a) Give the principle of estimation of hardness of water using EDTA method (only equations)(3 marks) 1 (b) Natural rubber needs to be vulacanised. Give reasons for the same.(3 marks) 1 (c) What are the function of lubricant ?(3 marks) 1 (d) Give the preperation, properties and uses of dolomite bricks.(3 marks) 1 (e) What is a condensed system? State the condensed phase rule equation.(3 marks) 1 (f) Classify the following salts into temporary and permanent hardness causing salts and also calculate their calcium carborate equivalents.
(i) Ca (HCO₃)₂ - 16.2 mg/L
(ii) MgSO₄ - 1.2 mg/L
(iii) FeCI₂ - 12.7 mg/L
(iv) NaCI - 94 mg/L (3 marks) 1 (g) Name the various ingredigents used in the compounding of plastics and give two examples of each.(3 marks) 2 (a) Calculate the quantity of pure lime and soda required for softening 50,000 litres of water containing the following salts per litre-
Ca (HCO₃)₂ - 8.1 mg;Mg (HCO₃)₂ - 7.3 mg;
CaSO₄ - 13.6 mg; MgSO₄ - 12.0 mg;
NaCI -4.7 mg; MgCI₂ - 23.75 mg.(6 marks) 2 (b) Define (i) Phase (ii) Component (iii) Degree of freedom. State the number of phase, components and the number of degree of freedom for the following equilibrium.
H₂O_(s) ? H₂O₍₁₎ ? H₂O (vapour) (5 marks) 2 (c) What are carbon nanotubes? Discuss the CVD method of preperation of CNT.(4 marks) 3 (a) Discuss the mechanism of boundry film lubrication.(6 marks) 3 (b) What are thermoplastics polymers? Name any two thermoplastics polmer.Give the preperation, properties and uses of any one thermoplastics polymer.(5 marks) 3 (c) Draw the phase diagram of one component water system. Explain triple point.(4 marks)

Write short notes on any two :-

4 (a) (i) Glass transition temperature(3 marks) 4 (a) (ii) Conducting polymers.(3 marks) 4 (a) (iii) Polymers used in medicine and surgery.(3 marks) 4 (b) With a neat diagrams explain the principle of Ion-Exchange method of softening of water and also give the softening and regeneration reactions.(5 marks) 4 (c) 3g of vagetable oil was mixed with 50 ml of 0.5N KOH solution and heated for 1 hour. The mixture required 19ml of 0.5 HCI. The blank titration reading was 49ml. Find the saponification value of the oil sample.(4 marks) 5 (a) Name the raw materials necessary for the manufacture of portland cement. Draw a neat labelled diagram of the rotary kill and write the chemcal reaction alongwith the temperature. Also mention the function of Alumina and gypsum in cement.(6 marks) 5 (b) What is moulding ? Explain with the help of a neat diagrams Extrusion moulding of an insulated cable.(5 marks) 5 (c) The hardness of 50,000 litres of a sample of water was removed by passing it through a zeolite softener. The sofener required 200 litres of NaCI solution containing 125 g/L of NaCI for regeneration. Calculate the hardness of the sample of water.(4 marks) 6 (a) (i) Define and explain the significance of BOD and COD.(3 marks) 6 (a) (ii) Discuss reverse osmosis.(3 marks) 6 (b) Give the preperation and uses of
(i) Kevlar
(ii) Polyurethane
(5 marks)

Write note on any two :-

6 (c) (i) Acid value of oil(2 marks) 6 (c) (ii) Flash and fire point(2 marks) 6 (c) (iii) Semi solid lubricant(2 marks)