We mostly use the substances which are mixtures .elements are single particle but the mixtures contains elements as well as the compounds......

Introduction:
In our everyday life, we come across a wide variety of substances. These substances can be categorized into different types based on their composition. The given options include elements, compounds, mixtures, and pure solutions. Among these, the correct answer is option 'C', which states that most of the substances we see around us are mixtures. Let's understand why mixtures are the most common type of substance.

Mixtures:
- A mixture is a combination of two or more substances that are physically mixed together, but not chemically combined.
- In a mixture, the substances retain their individual properties and can be separated by physical means.
- Mixtures can be made up of two or more elements, compounds, or a combination of both.
- Examples of mixtures include air, saltwater, soil, and trail mix.

Element:
- An element is a pure substance that cannot be broken down into simpler substances by chemical means.
- Elements are made up of identical atoms.
- Examples of elements include oxygen, carbon, hydrogen, and gold.
- While elements do exist in nature, they are relatively less common compared to mixtures.

Compound:
- A compound is a pure substance composed of two or more elements chemically combined in a fixed ratio.
- Compounds have properties different from those of their constituent elements.
- They can only be separated into their individual elements through chemical reactions.
- Examples of compounds include water (H2O), carbon dioxide (CO2), and sodium chloride (NaCl).
- Compounds are less common compared to mixtures.

Pure Solution:
- A pure solution is a homogeneous mixture where one substance (solvent) dissolves another substance (solute).
- The components of a pure solution cannot be easily separated by physical means.
- Examples of pure solutions include sugar dissolved in water and salt dissolved in water.
- Pure solutions are a specific type of mixture and are relatively less common compared to other mixtures.

Conclusion:
In conclusion, most of the substances that we see around us are mixtures. Mixtures are a combination of two or more substances that are physically mixed together but not chemically combined. Unlike elements and compounds, mixtures retain the individual properties of their constituent substances and can be separated by physical means. While elements, compounds, and pure solutions also exist, they are relatively less common compared to mixtures.