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Vinegar and Citric Acid

Vinegar and Citric Acid
What is the pH of the medium when sucrose is used as substrate for the production of citric acid?

5
4
6
3

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Vinegar and Citric Acid
Malt vinegar is produced from

fruit juices
malted grain
ale
ethanol

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Vinegar and Citric Acid
Which substrate is used in the fermentation of citric acid?

Starch hydrolysate
Sucrose
Beet molasses
All of these

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Vinegar and Citric Acid
During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?

HNO3
HCl
None of these
H2SO4

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Vinegar and Citric Acid
Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

Both (a) and (b)
Peptone
Urea
Ammonium salt

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Vinegar and Citric Acid
For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to

precipitate calcium sulphate
precipitate calcium carbonate
precipitate calcium citrate
precipitate calcium phosphate

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