Question

A _____ is a mixture of two or more substances in a single phase.
A. Element
B. Compound
C. Solution
D. None of the above

Answer 1

We know that a mixture always contains two or more substances that can be present in varying amounts. The components of a mixture do not lose their identities and they can be separated by their physical properties. There are two types of mixture,
- Homogeneous mixture
- Heterogeneous mixture
Homogeneous mixture consists of a single phase be it liquid, gas, or solid the chemical composition is the same for any sample of the mixture.
Heterogeneous mixtures consisting of different phases are not uniform; they will not have an identical composition.

Complete step by step answer: We remember that a solution is a homogeneous mixture that contains small particles and liquid solutions are transparent in nature.
The three different types of solutions and they are given below as,
Unsaturated Solution: A solution that contains less than the maximum number of grams per solute in solvent at a given temperature is called an unsaturated solution.
Saturated solution: A solution that contains the maximum number of grams of solute that can dissolve in solvent at a given temperature is called a saturated solution.
Supersaturated solution: A solution that has more than the maximum number of grams of solute that can dissolve in a solvent at a given temperature is called a supersaturated solution.
Therefore, we can say the solution is a mixture of two or more substances in a single phase.
$\therefore$, the option (C) is correct..

Note: We know that a single component that has a constant composition, irrespective of the sample size and the sample origin is called a pure substance. A pure substance could not be broken down to other pure substances by any physical change.
Example: Water, sugar etc.
Now, we can see how elements and compounds differ from each other.
- Element: A pure substance, which cannot be broken down into smaller substances by a chemical reaction is called an element.
Example: Hydrogen gas, Magnesium ribbon and copper wire etc.
- Compound: A pure substance that is formed by combination of two or more elements by chemical process is called a compound. Example: Sodium chloride is a compound because it is formed from elements sodium and chlorine