b)

19 a)
b)

20 a)

b)

0000CYT100121902

CN

H 71

06

What is meant by doping of polymers? Describe the different types of doping.

Module-V
Describe the steps involved in municipal water treatment.
The following data are obtained for a hard water sample from an EDTA
experiment
i) 20 mL standard hard water (5 g/L CaCO3) = 25 mL EDTA solution
ii) 100 mL of hard water sample = 24 mL EDTA solution
iii) 100 mL of boiled hard water sample = 18 mL EDTA solution
Calculate the temporary and permanent hardness.
With the help of a flow diagram explain the steps involved in sewage
treatment.
Calculate the temporary and permanent hardness of water sample containing
the following dissolved salts.
Ca(HCO3)2 = 28 mg/L; CaSO, = 18 mg/L; Mg(HCO3)) = 32 mg/L;
MgCl, = 30 mg/L; NaCl =58 mg/L.

Page 3 of 3

(6)

(10)
(4)

(10)

(4)