Question

fermentation of milk is a physical change or chemical

Answer 1

it is a chemical change

Answer 2

Answer:

It is a chemical change.

Explanation:

Because the bacteria breakdown the lactose in milk to lactic acid. This increases the acidity of milk due to which the milk protein casein coagulates as curd. This process is known as fermentation and requires a temperature of 35 - 40 degree Celcius. Hence making of Curd is not a physical change, it is a chemical change.