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Question

Which of the following is not a mixture?


A

air

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B

seawater

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C

pure water

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D

soil

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Solution

The correct option is C

pure water


The correct option is C.

The explanation for the correct answer:

  1. A mixture refers to a substance, which is formed of two or more components mixed together physically not chemically.
  2. A mixture can be homogenous or heterogeneous.
  3. A homogeneous mixture is a mixture in which the components mix with each other and its composition is uniform all through the solution.
  4. A heterogeneous mixture refers to the mixture in which the composition is not uniform all through and distinct components can be witnessed.
  5. Pure water or distilled water is not a mixture.
  6. Pure water is a kind of water in which no other impurities or components are present, that is, only molecules of water are present.
  7. Water is a pure substance or compound formed of oxygen and hydrogen.
  8. A mixture would be water with other things dissolved in it physically.

The explanation for the incorrect options:

Option A:

  1. Air is a mixture, not a compound.
  2. It is a mixture of gases like oxygen, nitrogen, nitrous oxide, methane, etc.
  3. Air is considered a mixture as the gases retain their characteristics when separated by the process of fractional distillation.

Option B:

  1. Sea water is a mixture of pure water and dissolved ionic substances.
  2. When the water in the seawater evaporates one can see salt behind.
  3. Sea water is a homogenous mixture of water and sodium chloride ions.

Option D:

  1. Soil is a mixture of dead and living organisms, minerals, water, and air.
  2. Soil is a heterogeneous mixture.

Final answer: Pure water is not a mixture.


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