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0000CYT100121901

Draw and explain the conformational isomerism in (cis) and (trans) 1,2-
dimethyl cyclohexane. Which conformer is more stable in each case? Give
reason.
Write the structure of Kevlar and explain why it is used in cryogenic
applications?

Module-V
Explain aerobic and anaerobic methods for the waste water treatment.
A water sample contains 16.2 mg/L Ca(HCO3), 7.3 mg/L Mg(HCO3)», 9.5
mg/L MgCl and 13.6 mg/L (4504. Calculate the temporary and permanent
hardness of water and what will happen if 10.6 mg/L NaHCO; is added?
Explain the complexometric titration method for the estimation of hardness of
water. Write necessary calculation steps.

Write any four disadvantages of hard water.

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