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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?

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

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

All of these
Starch hydrolysate
Sucrose
Beet molasses

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Vinegar and Citric Acid
Alegar is a type of vinegar produced from

malted grain
ethanol
fruit juices
ale

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Vinegar and Citric Acid
Vinegar production consists of

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

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

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

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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?

HCl
HNO3
None of these
H2SO4

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