Question

how would you show that setting of curd is a chemical change​

Answer 1

I buddy preparing a curd is chemical change because the milk has been changed into curd, its a irreversible change, permanent.

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Answer 2

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.