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a) What are conducting polymers? Write the structure of two conducting polymers and give their

method of preparation.
b) Write a note on OLED.

c) What are copolymers? Give two examples.
(5+3+2)

a) Explain knocking of Diesel.

b) On burning 0.83 g of a solid fuel in a bomb calorimeter, the temperature of 3500g of water
increased from 26.5 to 29.2°C Water equivalent of calorimeter and latent heat of steam are
385g and 587cal/g respectively. If the fuel contains 0.7% hydrogen calculate HCV and LCV
of the fuel.

c) Distinguish between Flash and Fire point and write their significance.

(3+4+3) OR
a) Describe how calorific value of a fuel is determined using a Bomb Calorimeter experiment.
b) Distinguish between HCV and LCV and derive the relation between them.
(545) 27. a) Describe EDTA method for the estimation of hardness of water.
b) 1.0 ‏ع‎ of റം ೫೩5 dissolved in HCl and diluted to llitre.5Oml of this standard hard water
requires 48 ml of EDTA while 50 ml of hard water sample requires 15ml of EDTA. On the other
hand 501111 of boiled hard water sample requires 1001 of EDTA solution. Calculate total,
temporary and permanent hardness of water. (5+5) OR
a)With the help of a neat diagram explain the Reverse Osmosis process.
Explain Trickling filter process.
A water sample contains Ca(HCO3)2=6.48ppm,CaSO.=8. 1600൩. 10-6൩. Find its temporary
and permanent hardness.

(At. Wt. of Ca=40, Mg=24, C=12, S=32, O=16,H=1) (4+3+3)

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