Question

during which of the following change a new substance​

Answer 1

Answer:

Melting and Freezing: During this the physical properties only changes not the chemical. Example can be taken as water freezing into ice and ice melting into water. Thence, no new substance is formed. 3) Crushing: If you crush a piece of chalk, you get even small pieces of chalk powder.

Answer 2

answer : durring chemical change