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Vinegar and Citric Acid

Vinegar and Citric Acid
Spirit vinegar is produced from

ale
ethanol
fruit juices
malted grain

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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?

5
3
6
4

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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
None of these
HCl
H2SO4

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Vinegar and Citric Acid
Cider vinegar is produced from

ale
fruit juices
ethanol
malted grain

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

Acetobacter
both (a) and (b)
Gluconobacter
Lactobacillus

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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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