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Home Biotechnology Vinegar and Citric Acid Comments

  • Question
  • 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

  • Correct Answer
  • anaerobic fermentation followed by aerobic fermentation 


  • Vinegar and Citric Acid problems


    Search Results


    • 1. Ethanol is oxidized to acetic acid aerobically using

    • Options
    • A. Acetobacter
    • B. Gluconobacter
    • C. both (a) and (b)
    • D. Lactobacillus
    • Discuss
    • 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
    • 3. Spirit vinegar is produced from

    • Options
    • A. fruit juices
    • B. malted grain
    • C. ethanol
    • D. ale
    • Discuss
    • 4. Candida utilis is used for the fermentation of waste sulphate liquor since it ferments

    • Options
    • A. hexoses only
    • B. pentoses only
    • C. both hexoses and pentoses
    • D. none of these
    • Discuss
    • 5. Ethanol is produced by

    • Options
    • A. continuous fermentation
    • B. batch fermentation
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 6. 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
    • 7. 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
    • 8. Which substrate is used in the fermentation of citric acid?

    • Options
    • A. Beet molasses
    • B. Sucrose
    • C. Starch hydrolysate
    • D. All of these
    • Discuss
    • 9. 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
    • Discuss
    • 10. 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


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