Question

How can you prove that the formation of curd from milk is a chemical change?​

Answer 1

Answer:

Because when milk changes into curd a new substance is formed and that substance i.e. curd is formed which cannot be changed back into milk. Therefore, it is a chemical change.

Answer 2

Answer:

Making of curd from milk is a chemical change. The bacteria Lactobacillus when added to milk converts it into curd. 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.