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Food Science and Technology QUESTION #5915
Question 1
The detection of alkali (neutralizer) addition to milk uses which test?
  • Alizarin test or Rosalic acid test✔️
  • Clot on boiling test
  • Alcohol precipitation test
  • Gerber test
Correct Answer Explanation
Alizarin changes color depending on milk \(\text{pH}\): yellow in acidic milk and pink/red in alkaline milk. The Rosalic acid test similarly detects added alkalis (\(\text{NaHCO}_3\), \(\text{Na}_2\text{CO}_3\), \(\text{NaOH}\)) used by adulterators to neutralize sour milk. Normal milk gives a yellow-brown color.