1(a) Discuss the drawback of natural rubber.

1(b) Explain the disinfection of water by addition of bleaching powder

1(c) What are the limitations of Phase rule?

1(d) Discuss fullerenes. Give its applications.

1(e) Write a note on Greases.

1(f) A 10ml of sample of water was refluxed with 20ml potassium dichromate solution and after refluxing the excess unreacted dichromate required 26.2ml of 0.1M FAS solution. A blank 10 ml of distilled water on refluxing with 20ml of dichromate solution required 36ml of 0.1M FAS solution. Calculate the COD of waste water.

1(g) Discuss the role of polymer in medicine and surgery.

2(a) Calculate the amount of lime (85% pure) and soda (95% pure) required to soften one million litre of water which contains $CaCO_{3}$ =12.5ppm, $MgCO_{3}$=8.4ppm, CaCl_{2}=22.2ppm, $MgCl_{2}$ =9.5ppm, $CO_{2}$=33ppm, HCl=7.3ppm, organic matter= 16.8ppm.

2(b)i Give the preparations, properties and uses of Kevlar .

2(b)ii Define Cloud point and Pour point of a lubricant .

2(b)iii Write a note on decay of concrete.

3(a) Define Moulding.List the different techniques of moulding. Explain injection moulding with the help of neat diagram.

3(b)i Explain the term ‘phase’ with appropriate examples.

3(b)ii Discuss the role of gypsum during the manufacturing of Portland cement.

3(c) Calculate the total hardness in ppm in given water sample:
1.50ml of standard hard water, containing 1 mg pure $CACO_{3}$ per ml consumed 20ml EDT solution. 2.50ml of water sample consumed 30ml EDTA solution using EBT indicator.

4(a) Explain the zeolite method for softening of water giving suitable diagram and reactions. What are the limitations of this method?

4(b)i 6gms of oil was saponified with 50ml of 0.5N alcoholic KOH solution. After refluxing for 2 hours the mixture was titrated with 25ml 0.5N HCl. Find the saponification value of oil.

4(b)ii Distinguish between the wet and dry process for manufacturing of Portland cement.

4(c) Discuss the following additives in compound of plastics i) Fillers ii) Plasticizers

5(a) Write a note on (any two):- (6 marks) i) Glass transition temperature ii) Buna-S c)Vulcanization

5(b)i Distinguish between BOD and COD

5(b)ii Define Oiliness. What is its significance?

5(c) Discuss the application of Phase rule to the one component system based on: Diagram, triple point

6(a) Define lubricants and lubrication. Mention the various mechanisms involved in lubrication of machine. Discuss boundary lubrication.

6(b)i What is reduced or condensed phase rule

6(b)ii Discuss Reverse Osmosis

6(c) What are carbon nanotubes. What are its types? Discuss the laser method for its production.