VINEGAR AND CITRIC ACID QUIZ

Cider vinegar is produced from

malted grain

fruit juices

ale

ethanol

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YOUR ANSWER : ?

Which of the following microorganism is used for the production of citric acid?

Lactobacillus bulgaricus

Aspergillus niger

Saccharomyces cerevisiae

Streptococcus lactis

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What is the pH of the medium when molasses is used as substrate for the production of citric acid?

6

3

5

4

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Malt vinegar is produced from

malted grain

ethanol

ale

fruit juices

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

3

4

5

6

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Sugar content of the fermentation medium for citric acid is maintained at

10-15%

20-25 %

15-20%

25-30 %

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

precipitate calcium citrate

precipitate calcium carbonate

precipitate calcium sulphate

precipitate calcium phosphate

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

HCl

None of these

HNO3

H2SO4

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Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

Ammonium salt

Both (a) and (b)

Urea

Peptone

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Vinegar production consists of

anaerobic fermentation followed by aerobic fermentation

aerobic fermentation followed by anaerobic fermentation

aerobic fermentation

anaerobic fermentation

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