VINEGAR AND CITRIC ACID QUIZ

In liquid surface culture 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)

TRUE ANSWER : ?
YOUR ANSWER : ?

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 is used with solid substrate as sweet potato

A. niger floats on the surface of solution

TRUE ANSWER : ?
YOUR ANSWER : ?

During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?

H2SO4

HCl

HNO3

None of these

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Alegar is a type of vinegar produced from

malted grain

ale

ethanol

fruit juices

TRUE ANSWER : ?
YOUR ANSWER : ?

Sugar content of the fermentation medium for citric acid is maintained at

20-25 %

25-30 %

10-15%

15-20%

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What is the pH of the medium when molasses is used as substrate for the production of citric acid?

4

3

6

5

TRUE ANSWER : ?
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Spirit vinegar is produced from

malted grain

ale

fruit juices

ethanol

TRUE ANSWER : ?
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What is the pH of the medium when sucrose is used as substrate for the production of citric acid?

6

4

3

5

TRUE ANSWER : ?
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Malt vinegar is produced from

fruit juices

malted grain

ale

ethanol

TRUE ANSWER : ?
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Ethanol is oxidized to acetic acid aerobically using

both (a) and (b)

Lactobacillus

Gluconobacter

Acetobacter

TRUE ANSWER : ?
YOUR ANSWER : ?