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Use of oxygen and formation of carbon dioxide in respiration is what type of change?

Answer and explanation

Correct answer: Chemical change

The direct answer is option A: respiration is a chemical change. During respiration, oxygen helps break down food molecules, and carbon dioxide and water are formed while energy is released for the body. Because new substances form and the original materials are chemically changed, this is not merely a physical process. Option A is correct. Option B is wrong because physical change does not create new chemical substances, whereas respiration does. Option C, filtration, is a separation method based on particle size and does not describe respiration. Option D, sublimation, is the direct change of a solid into a gas and is unrelated to breathing. Memory cue: oxygen used plus carbon dioxide formed means a chemical reaction is occurring.

Related tags

ChemistryNature-Of-MatterClass-11

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