Partial pressure of a solution component is directly proportional to its mole fraction. This statement is known as

Options

A. Henry's law
B. Raoult's law
C. Distribution law
D. Ostwald's dilution law

Answer

To solve the question, we need to identify which law states that the partial pressure of a solution component is directly proportional to its mole fraction. Let's go through the steps to arrive at the answer.

### Step-by-Step Solution:

1. **Understanding the Question**:
The question states that the partial pressure of a solution component is directly proportional to its mole fraction. We need to identify the law that describes this relationship.

2. **Reviewing Relevant Laws**:
- **Henry's Law**: This law states that the amount of gas that dissolves in a liquid at a given temperature is proportional to the partial pressure of that gas above the liquid. It is not directly related to mole fractions in solutions.
- **Raoult's Law**: This law states that the partial vapor pressure of each volatile component in a solution is directly proportional to its mole fraction in the solution. This matches the statement in the question.
- **Distribution Law**: This law refers to the distribution of a solute between two immiscible solvents and does not specifically address partial pressures or mole fractions.
- **Ostwald's Distribution Law**: This law is a specific case of the distribution law and also does not pertain to the relationship between partial pressure and mole fraction.

3. **Identifying the Correct Law**:
Since Raoult's Law directly states that the partial pressure of a component in a solution is proportional to its mole fraction, we conclude that the correct answer is Raoult's Law.

4. **Final Answer**:
The statement "Partial pressure of a solution component is directly proportional to its mole fraction" is known as **Raoult's Law**.