Question

Curdling of milk is a________ and a desirable change.

Answer 1

Definition of chemical change.

A change that is permanent in nature and leads to the formation of a new substance with composition and properties different from those of the original substance is called a chemical change.

Definition of desirable change.

Changes that are beneficial for living beings are called desirable changes.

During the process of curdling milk, milk is converted into curd or yogurt by the process of fermentation.

Hence Curdling of milk is a chemical and a desirable change.