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CGP EDU Academic Team
Published on: September 12, 2026
A liquid boils when its vapour pressure equals
Text Solution
Verified by ExpertsThe correct answer is:
A
Step 1: Understand the concept of boiling point. A liquid boils when its vapor pressure is equal to the pressure exerted on it from its surroundings.
Step 2: Identify the surrounding pressure when boiling occurs. At sea level, this is typically the atmospheric pressure.
Step 3: Review the options:
Step 2: Identify the surrounding pressure when boiling occurs. At sea level, this is typically the atmospheric pressure.
Step 3: Review the options:
- Option A states: The atmospheric pressure - this is correct as a liquid boils when its vapor pressure equals the atmospheric pressure.
- Option B (Pressure of 76.0 cm column of mercury) is an expression of atmospheric pressure at sea level, but more general.
- Option C (The critical pressure) refers to the maximum pressure at which a substance can exist in the liquid phase.
- Option D (The dew point of the surroundings) relates to condensation, not boiling.
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