Chemistry
Grade-10
Easy

Question

Which of the following is NOT an example of a physical change?

  1. Crumpled paper
  2. Pencil sharpening
  3. Shrunken clothing
  4. Sour milk

hintHint:

A physical change is a type of temporary change where the physical properties of matter change. This physical change involves no new substance formation. While the chemical change involves a new product formation.

The correct answer is: Sour milk


    Sour milk is not an example of physical change.
    • The souring of milk is classified as a chemical change because it results in the production of a new substance i.e. sour-tasting lactic acid.

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