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The pH of molasses solution in the manufacture of ethanol should be __________

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The pH of molasses solution in the manufacture of ethanol should be __________

(a) 1-2

(b) 2-3

(c) 7-9

(d) 4-5

I have been asked this question during an interview.

The question is from C2 Compounds topic in section Synthetic Organic Chemical Industries of Chemical Technology

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Right choice is (d) 4-5

Easiest explanation: The pH of the molasses solution must be in the range of 4-5 to support yeast growth which furnishes invertase and zymase. pH is adjusted by adding sulfuric acid.

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