Read the passage carefully and answer the Questions
A homogeneous mixture of two or more than two components has uniform composition and properties. The binary solutions have two components, which may be solid, liquid or gas. The resultant solution has a larger amount of solvent and a smaller amount of solute. The amount of solute in a given amount of solvent decides the concentration of the resulting solution. The concentration can be expressed in various ways, like molarity, molality, normality and mole fraction.
Parts per million (ppm) is represented as:

1. A parts per million \(=\frac{\text { Number of parts of the component }}{\text { Total number of parts of all components of the solution }} \times 10^6\)
2. B parts per million \(=\frac{\text { Number of parts of the component }}{\text { Total number of parts of all components of the solution }} \times 10^5\)
3. C parts per million \(=\frac{\text { Number of parts of the component }}{\text { Total number of parts of all components of the solution }} \times 10^3\)
4. D parts per million \(=\frac{\text { Number of parts of the component }}{\text { Total number of parts of all components of the solution }} \times 10^6\)