CHEMISTRY

1. Answer any Four of the following:

   1. Define a Polymer.

   2. What is meant by the degree of polymerization?

   3. Why do all simple organic molecules not produce polymers?

   4. Why are plastics indispensible in everyday life?

   5. Why is Teflon highly chemical-resistant?

   6. Describe the mechanism of Diels-Alder reaction.

2. Answer any Four of the following:

   1. Define corrosion.

   2. Discuss the mechanism of electrochemical corrosion.

   3. What is meant by the term Passivity?

   4. What are the factors which affect corrosion?

   5. Comment on the use of aluminium in place of zinc for cathodic protection of iron from rusting.

   6. How much rust (Fe ₂O ₃.3H ₂O) will be formed when 100 kg of iron have completely rusted away?

3. Answer any Four of the following:

   1. Define a chemical fuel.

   2. What is meant by calorific value of fuel? What is the difference between gross calorific value and net calorific value?

   3. Why are gaseous fuels more advantageous than solid fuels?

   4. Write the constituents responsible for the permanent hardness of water. Discuss one treatment method.

   5. Why does hard water consume a lot of soap?

   6. Why does magnesium bicarbonate require double amount of lime for softening?

4. Answer any Two of the following:

   1. How is ozone formed and depleted in nature? What are the consequences of depletion of the ozone layer in the atmosphere?

   2. Describe the characteristics of major atmospheric regions.

   3. State the intermediate compound formation and absorption theories of catalysis and...