Properties of components are replaced by new properties are a mixture or a compound?

When the properties of individual components change completely to form new properties, the result is a compound, not a mixture. In a compound, the elements react chemically and lose their original characteristics to form a new substance with entirely different properties. For example, when hydrogen and oxygen combine, they form water (H₂O). The resulting compound has new properties — water can extinguish fire, while both hydrogen and oxygen individually support combustion. This shows that chemical bonding creates a new set of properties distinct from the parent elements.

In contrast, a mixture is simply a physical combination of substances where each component retains its own properties. For instance, air is a mixture of gases like nitrogen and oxygen, but they do not react chemically. You can still separate them through physical methods, and their properties remain unchanged.