Question

Fresh milk has pH 6. When it changes to curd, pH becomes________.

• A. 7
• B. more than 7
• C. less than 6
• D. remain same

Answer 1

The correct option is C

less than 6

The explanation for the correct option (C):

• pH refers to the potential of Hydrogen (H).
• pH is a scale that is used to determine the acidic or basic strength of the solution.
• The pH of the solution less than 7 indicates that the solution is acidic in nature. The pH value greater than 7 indicates that the solution is basic in nature and the pH value 7 indicates that the solution is neutral in nature.
• Milk has a pH of 6. This indicates that it is acidic in nature. Lactic acid (C₃H₆O₃) is obtained when milk is transformed into curd owing to the action of bacteria.
• Lactic acid is more acidic in nature. As a result, the pH of the milk decreases (less than 6) as it transforms into curd.

Final Answer: Hence, option (C) is correct. pH becomes less than 6.