Vinegar and Citric Acid problems
- 1. Spirit vinegar is produced from
Options- A. fruit juices
- B. malted grain
- C. ethanol
- D. ale Discuss
Correct Answer: ethanol
- 2. For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to
Options- A. precipitate calcium carbonate
- B. precipitate calcium citrate
- C. precipitate calcium phosphate
- D. precipitate calcium sulphate Discuss
Correct Answer: precipitate calcium citrate
- 3. Ethanol is oxidized to acetic acid aerobically using
Options- A. Acetobacter
- B. Gluconobacter
- C. both (a) and (b)
- D. Lactobacillus Discuss
Correct Answer: both (a) and (b)
- 4. Vinegar production consists of
Options- A. aerobic fermentation
- B. anaerobic fermentation
- C. aerobic fermentation followed by anaerobic fermentation
- D. anaerobic fermentation followed by aerobic fermentation Discuss
Correct Answer: anaerobic fermentation followed by aerobic fermentation
- 5. In koji process for the fermentation to produce citric acid,
Options- A. A. niger is used with solid substrate as sweet potato
- B. A. niger floats on the surface of solution
- C. Fungal mycelium grows through out the solution in a deep tank
- D. both (a) and (b) Discuss
Correct Answer: A. niger is used with solid substrate as sweet potato
- 6. During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?
Options- A. HCl
- B. HNO3
- C. H2SO4
- D. None of these Discuss
Correct Answer: H2SO4
- 7. Which substrate is used in the fermentation of citric acid?
Options- A. Beet molasses
- B. Sucrose
- C. Starch hydrolysate
- D. All of these Discuss
Correct Answer: All of these
- 8. What is the pH of the medium when molasses is used as substrate for the production of citric acid?
Options- A. 3
- B. 4
- C. 5
- D. 6 Also asked in: Bank Exams, CAT
Correct Answer: 5
- 9. Which of the following nitrogen sources is added in the fermentation medium of citric acid production?
Options- A. Ammonium salt
- B. Urea
- C. Both (a) and (b)
- D. Peptone Discuss
Correct Answer: Both (a) and (b)
- 10. In liquid surface culture process for the fermentation to produce citric acid,
Options- A. A. niger is used with solid substrate as sweet potato
- B. A. niger floats on the surface of solution
- C. Fungal mycelium grows through out the solution in a deep tank
- D. both (a) and (b) Discuss
Correct Answer: A. niger floats on the surface of solution
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