Chemical Industry and Manufacturing: Six Processes, One Table

In the paper

Unit 4 carries 3 of the 50 chemistry marks; with three chapters sharing them, this one averages one (MEC publishes weights by unit, not by chapter). It is the only chapter in the whole Chemistry syllabus that asks about money, plant layout and effluent, so it is also the one most candidates skip.

The MEC scope line runs: Chemical industry: importance and production stages. Economical production and plant management: cost, cash flow, operation and design. Continuous and batch processing. Environmental effect of the chemical industry and control measures. Cement; paper and pulp. Ostwald's process (nitric acid), Haber's process (ammonia), Contact process (sulphuric acid), diaphragm cell (caustic soda), Solvay process (sodium carbonate), ammonium-carbamate process (urea). The headings below are its points in MEC's order.

Three ways it comes: recall (the Contact catalyst, what gypsum does in cement, which cell makes caustic soda); understanding (why SO₃ is absorbed in acid and not in water, why a pharmaceutical plant runs batch while a cement plant runs continuous); application (a described plant's cost figures, or naming the process from its raw materials). The six-row process table below is the chapter — learn it before anything else.