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Vinegar and Citric Acid

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

Starch hydrolysate
All of these
Sucrose
Beet molasses

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Vinegar and Citric Acid
Vinegar production consists of

aerobic fermentation
aerobic fermentation followed by anaerobic fermentation
anaerobic fermentation
anaerobic fermentation followed by aerobic fermentation

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

6
3
5
4

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

5
4
3
6

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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?

None of these
HNO3
HCl
H2SO4

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Vinegar and Citric Acid
Ethanol is oxidized to acetic acid aerobically using

Acetobacter
Lactobacillus
Gluconobacter
both (a) and (b)

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