Which of the following is not a chemical change?

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Growth of a plant

Rusting of iron

Mixing of iron filings and sand

Cooking of food

answer is C.

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Detailed Solution

Mixing of iron filings and sand is not an example of chemical change. Growth of plants,rusting of iron and cooking of food are chemical changes. While a physical change occurs when matter changes forms without changing its chemical identity, a chemical change is the result of a chemical reaction. The five elements of chemical change are colour change, precipitate or gas formation, smell change, temperature change, and precipitate or gas formation. Only physical properties, such as shape, size, etc., are impacted by a physical change.
Both of them involve alterations to the state of matter. Both of them undergo energy shifts.
If the chemical composition is changing, then it is a chemical change, and if the chemical composition is remaining the same, then it is a physical change. Therefore, Growth of a plant, Rusting of iron and Cooking of food are chemical changes.

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