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Assertion:At equilibrium , vapour phase ...

Assertion:At equilibrium , vapour phase will be always rich in component which is more volatile
Reason : The composition of vapour phase in equilibrium with the solution is determined by the partial pressures of the components

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states: "At equilibrium, the vapor phase will be always rich in the component which is more volatile." - **Explanation**: A more volatile component has a higher tendency to escape from the liquid phase into the vapor phase. Therefore, when a mixture reaches equilibrium, the vapor phase will contain a higher concentration of the more volatile component compared to the less volatile component. ### Step 2: Understand the Reason The reason states: "The composition of the vapor phase in equilibrium with the solution is determined by the partial pressures of the components." - **Explanation**: The partial pressure of a component in a mixture is a measure of its contribution to the total pressure exerted by the vapor. According to Raoult's Law, the partial pressure of a component in the vapor phase is proportional to its mole fraction in the liquid phase and its vapor pressure when pure. Thus, the composition of the vapor phase is indeed determined by the partial pressures of the components. ### Step 3: Analyze the Relationship Now, we need to connect the assertion and the reason: - Since the more volatile component has a higher vapor pressure, it will exert a greater partial pressure when in equilibrium with the liquid phase. This means that the vapor phase will have a higher mole fraction of the more volatile component. ### Step 4: Conclusion Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is: **Both assertion and reason are true, and the reason is the correct explanation of the assertion.** ### Final Answer: **Option A: Both assertion and reason are true, and the reason is the correct explanation of the assertion.** ---
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