Discussion
Match each residue in List I with its principal outlet in List II.
List I
A. Rice husk
B. Rice bran
C. Molasses
D. Citrus peel
List II
1. Edible oil and defatted feed
2. Boiler fuel and pozzolanic ash
3. Pectin
4. Ethanol and feed supplement
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Each residue is matched to its principal outlet. Rice husk (A) goes to boiler fuel and pozzolanic ash (2); rice bran (B) to edible oil and defatted feed (1).
Molasses (C) goes to ethanol and feed supplement (4), and citrus peel (D) to pectin (3). Note the pattern: each outlet exploits the one constituent present in unusual concentration - silica, oil, fermentable sugar and pectin respectively - which is the general rule for by-product utilisation.
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