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Vinegar and Citric Acid

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

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

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Vinegar and Citric Acid
Cider vinegar is produced from

fruit juices
malted grain
ethanol
ale

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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?

H2SO4
None of these
HCl
HNO3

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

Acetobacter
Gluconobacter
Lactobacillus
both (a) and (b)

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Vinegar and Citric Acid
Which of the following microorganism is used for the production of citric acid?

Lactobacillus bulgaricus
Aspergillus niger
Streptococcus lactis
Saccharomyces cerevisiae

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Vinegar and Citric Acid
In submerged process for the fermentation to produce citric acid,

A. niger floats on the surface of solution
Fungal mycelium grows through out the solution in a deep tank
A. niger is used with solid substrate as sweet potato
both (a) and (b)

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