Applied Chemistry 1 - Dec 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) What Happens when temporary hard water is boiled ? Give equation to explain.(3 marks) 1 (b) Give the preperation and uses of Silica refractory.(3 marks) 1 (c) Define Gibbs Phase Rule. State the number of Phases, Components and Degree of freedom for the following equation -
CaCo_3(s) ? CaO_(s) + CO_2(g)(3 marks) 1 (d) What is the function of plasticiser in the compounding of plastic? Give two examples.(3 marks) 1 (e) Two samples of water A and B were analysis for their salt content :
(i) Sample A was found to contain 168 mg MgCO₃ per litre.
(ii) Sample B was found to contain 820 mg Ca(NO₃)₂ per litre and 2 mg SiO₂ per litre. Calculate the total hardness of each sample and state which sample is more hard.(3 marks) 1 (f) Discuss the condition under which semisolid lubricants are used.(3 marks) 1 (g) Distinguish between thermoplastics and thermosetting resins.(3 marks) 2 (a) 50 ml of standard hard water containing 1 mg of pure CaCO₃ per ml consued 20 ml of EDTA. 50 ml of the water sample consumed 30 ml of same EDTA solution using Erichrome Black T indicator. After boiling and filtering, 50 ml of the water sample required 10 ml of the same EDTA for titration. Calculate the total and permanent hardness of water sample.(6 marks) 2 (b) Draw a neat phase diagram of the one component water system and explain with reference to (i) curves (ii) Triple point (5 marks) 2 (c) What are carbon nano tubes ? What are their types? Discuss their Electrical and Mechanical properties.(4 marks) 3 (a) Discuss the mechanism of thick- film lubrication.(6 marks) 3 (b) Discuss moduling and discuss the Injection moduling method of fabrication of plastic.(5 marks) 3 (c) Discuss the Limitations of phase rule.(4 marks) 4 (a) Give the preperation, properties and uses of : (i) PMMA (ii) Buna-s(6 marks) 4 (b) Give well balanced equation of the reactions that takes place in the Lime soda process.(5 marks) 4 (c) Find the saponification value of an oil sample 1.5g refluxed with 25 ml of 0.5 N KOH required 15 ml of 0.5 N HCI for the residual titration. The blank titration reading was 25 ml of 0.5 N HCI.(4 marks) 5 (a) Discuss the setting and hardening of portland cement as well as the function of gypsum with balanced equations.(6 marks) 5 (b) What is glass transition temperature? What are the factor that affect it and what is the signification of it.(5 marks) 5 (c) An exhausted zeolite softner was regenerated by passing 150 litres of NaCI solution having a strength of 150 g/L of NaCI. If the hardness of the water is 600 ppm. Calculate the total volume of water that is softned by the softner.(4 marks)

Write short notes on any two :-

6 (a) (i) Reverse osmosis(3 marks) 6 (a) (ii) Electrodialysis(3 marks) 6 (a) (iii) Ultrafiltration(3 marks) 6 (b) Define conducting polymers. Explain Intrinsic and Doped conducting polymer with approprite examples.(5 marks) 6 (c) Define and discuss the significance of the following properties of lubricant (any two) :-
(i) Acid value of oil
(ii) Cloud and Pour point
(iii) Flash and Fire point
(4 marks)