Question

Making of curd from milk is a physical change.How?

Answer 1

Its a chemical change..... This change is done by lactobacillus, a bacteria.

Answer 2

No.. Its a chemical change because In the setting of curd, milk changes into new substance, curd. This is an irreversible process that means milk cannot be made from curd. Formation of new substance and irreversible process shows that setting of curd is a chemical change.