Question

4. Milk becomes sour if kept for a long time. What
is this type of change called?​

Answer 1

Answer:

chemical change. hi hi hi

Answer 2

Answer:

When the milk is left in open for a long time, bacteria named lactobecillus grows in the milk. These bacteria converts the lactose present in the milk into lactic acid. Due to the presence of lactic acid the taste of the milk changes to sour. Milk becomes sour as it is left in open air and will be attacked by bacteria.

Explanation:

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