Question

Why curdling of milk is a physical change? Lactic acid is produced?

Answer 1

Answer:

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Explanation:

When milk goes “off” or turns sour, it is because acids produced by bacteria lower the pH of milk so the proteins can clump together. The increased acidity of the milk also causes it to taste sour. The bacteria living in milk naturally produce lactic acid as they digest lactose so they can grow and reproduce.