Multiple choice

Which one of the following is not a mixture?

  1. Sea water

  2. Air

  3. Common salt

  4. Pickle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Common salt (NaCl) is a pure compound, not a mixture, because it has a fixed chemical composition and consistent properties throughout - every part is identical NaCl. Sea water contains salt, minerals, and organic matter (mixture), air is a mixture of nitrogen, oxygen, CO2 and other gases, and pickle contains spices, oil, salt, water and other ingredients (mixture).

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