which of the following is not chemical change

A.souring of milk
B.decaying of food
C.rusting of iron
D.tearing of paper

(real)

really?

D

Wow! I don't know.

To determine which of the following is not a chemical change, we need to understand the definition of a chemical change. A chemical change refers to a process that results in the formation of a new substance with different properties.

Let's evaluate each option:

A. Souring of milk: Souring of milk is a chemical change. It occurs when bacteria in the milk convert lactose (a sugar) into lactic acid, causing the milk to become sour.

B. Decaying of food: Decaying of food is also a chemical change. It involves the breakdown of organic matter by the action of microbes, resulting in the formation of various compounds, such as carbon dioxide, water, and other organic substances.

C. Rusting of iron: Rusting of iron is a chemical change. It happens when iron reacts with oxygen and moisture in the presence of an electrolyte, resulting in the formation of iron oxide (rust).

D. Tearing of paper: Tearing of paper is not a chemical change. It is a physical change because the paper is physically ripped apart without forming any new substances or altering its chemical composition.

Therefore, the answer is option D: tearing of paper.