Which of the following is not a mixture. (1) air. (2) seawater. (3) pure water. (4) soil.

Answer: (3)

The resulting substance is called a mixture if two or more substances combine with each other without participating in a chemical modification.

The result produced by the mixture of substances does not lose its identity, nor is it chemically mixed. Mixtures are the only result of chemical substances such as elements and compounds being combined or mixed in a mechanical manner.

Specific Characteristics of Mixtures

Two or more compounds that are not chemically combined with each other are composed of mixtures. The properties of the mixes are set out below.

  • The elements of a mixture each retain their original properties.
  • The component separation can be achieved easily.
  • The component proportion is variable.

Examples of mixture

  1. Crude oil is a mixture of organic substance mainly hydrocarbons
  2. Seawater is a mixture of water and various salts.
  3. Air is a blend of different gases such as oxygen, carbon dioxide, nitrogen, argon, neon, and so on.
  4. Ink is a blend of colored dyes.
  5. Gunpowder is Sulfur, potassium nitrate and carbon mixture.

Whereas pure water is not an example of mixture.

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