Question

formation of curd into milk is a chemical change give reason​

Answer 1

Explanation:

Formation of new substance and irreversible process shows that setting of curd is a chemical change. Process of conversion of milk into curd : ... The curd forms because of the chemical reaction between the lactic acid bacteria and casein. During fermentation, the bacteria use enzymes to produce energy (ATP) from lactose.

Answer 2

Your question is wrong

Explanation:

The question should be

Formation of milk into curd is a chemical change. Give reason.

And the answer is

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.