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Vinegar and Citric Acid

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
In submerged process for the fermentation to produce citric acid,

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

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

malted grain
ale
ethanol
fruit juices

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Vinegar and Citric Acid
Sugar content of the fermentation medium for citric acid is maintained at

20-25 %
10-15%
25-30 %
15-20%

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Vinegar and Citric Acid
Vinegar production consists of

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

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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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