Question

12. Which of the following is not an 0 points example of chemical change? O a) Milk changes to curd O b) Rusting of iron O c) Digestion of food in our body O d) Changing of water to water vapour​

Answer 1

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Option A,B,C are correct

Explanation:

Chemical changes occur when a substance combines with another to form a new substance

Here,

In option A- Milk changes into curd forming a new subtance.

In option B-  Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting. Rusting of iron is a continuous process which slowly eats up the iron objects and makes them useless.

In option C-  Food digestion is a chemical change because enzymes in the stomach and intestines break down large macromolecules into simpler molecules so that the body can more easily absorb the food. In physical digestion, your body mechanically breaks down food, grinding or smashing it into smaller pieces.