1) Write down the characteristics of petroleum refining. What do you mean by catalytic reforming? Describe how plastics are categorized? Write down the methods in which polymerization takes place? Write down the name of three synthetic fibers. Write down the example of polyester. Write down the name of three synthetic rubbers.
2) For what kind of materials in vegetable tanning is used? Categorize the dyes and explain them in detail. Write down the name of two tanning processes in leather industry.