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Vinegar and Citric Acid

Vinegar and Citric Acid
Malt vinegar is produced from

ethanol
malted grain
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
anaerobic fermentation
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?

5
4
3
6

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Vinegar and Citric Acid
For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to

precipitate calcium phosphate
precipitate calcium sulphate
precipitate calcium citrate
precipitate calcium carbonate

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

both (a) and (b)
Lactobacillus
Gluconobacter
Acetobacter

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

Starch hydrolysate
Sucrose
Beet molasses
All of these

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