Multiple choice

Which of the following statements is not correct about the characteristics of air?

  1. The composition of air is variable

  2. The components retain their original properties

  3. Air can be represented by a chemical formula

  4. Components of air do not react with each other
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Air is a mixture, not a compound. Mixtures cannot be represented by single chemical formulas because they contain multiple substances that don't combine chemically. The components of air (nitrogen, oxygen, argon, CO2, water vapor) retain their individual properties and proportions can vary, which is why there's no single formula like there is for compounds.

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