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APPLIED CHEMISTRY 1 CBCGS MAY 2017
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APPLIED CHEMISTRY (CBCGS MAY 2017)

Q.1 (a) What are cation and anion exchangers?

(b) Give the preparation, properties and uses of polymethyl methacrylate polymer.

(c) A 10ml of sample of waste water was refluxed with 20ml of potassium dichromate solution and after refluxing the excess unreacted dichromate required 36.2ml of 0.1m FAS solution. A blank of distilled water on refluxing with 20ml of dichromate solution required 46ml of 0.1M FAS solution. Calculate the COD value of waste water.

(d) i) Flash point

ii) Oiliness

Iii) Pour point

(e) What is reduced phase rule?

(f) What are the draw backs of natural rubber?

(g) Explain CVD method for production of CNT’s ?

Q.2 (a) Calculate the amount of lime (80% purity) and soda (90% purity) required for softening of 50,000 of hard water whose chemical analysis results are given below. Ca($HCO_{3})$=40.5mg/L, Mg$(HCO_{3})_{2}$=73.0mg/L, Mg$SO_{4}$=60.0mg/L, Ca$SO_{4}$=mg/L, Ca$Cl_{2}$=27.5mg/L and NaCl=20.0mg/L

(b) i) Write a brief note on conducting polymers

ii) Mention the conditions under which semi-solid lubricants can be used

(c) Explain with the help of chemical reactions ‘setting and hardening’ process of cement

Q.3 (a) Write a short note on:

i) Injection moulding method for plastic

ii) Polymer in medicine and surgery

(b) i) Draw and explain important features of phase diagram of water system.

ii) Mention the Raw material of Portland cement along with their percentage composition.

(c) Ten thousand liters of hard water was made soft with zeolite. The exhausted zeolite required a total amount of 8 lit of NaCl solution containing 150gm per liter for regeneration. Calculate the hardness of water

Q.4 (a) Explain Ion-exchange process for Softening of hard water. What are its advantages and disadvantages?

(b) i) 9ml of oil is taken from machine and it requires 1.5ml of 0.04 N KOH. Find acid value (density=0.81 g/ml) .

ii) Write a note on Decay of Concrete

(c) What are the additives mixed with plastics for its compounding? Explain their functions

Q.5 (a) i) Distinguish between Thermoplastic and Thermosetting plastic.

ii) Write a note on Visco-elastic state.

(b) i) Writ a note on Ultrafiltration method for purification of water.

ii) give the important functions of lubricant.

(c) What is the mathematical form of the Gibbs phase rule equation? Explain the meaning of each one term involved in it.

Q.6 (a) What is lubrication? Explain the mechanism of fluid film lubrication.

(b) i) What is meant by Triple point? Apply phase rule and find degree of freedom for triple point.

ii) Distinguish between temporary and permanent hardness of water.

(c) Describe the wet process for manufacture of Portland cement.

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