Discussion
Arrange the stages of cane sugar manufacture in order.
1. evaporation to a thick syrup
2. milling of the cane to extract juice
3. crystallisation and centrifuging
4. clarification of the juice
Answer: B
Correct answer: 2 - 4 - 1 - 3
The order is fixed by what each step needs. The cane is milled to extract the juice, the juice is clarified before it is concentrated so that the impurities do not become more troublesome, the clear juice is evaporated to a thick syrup, and the syrup is boiled to crystals which are then separated by centrifuge. Evaporating before clarifying would concentrate the impurities along with the sugar.
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