When does a liquid start boiling?
Answer and explanation
Correct answer: When its vapour pressure becomes equal to the external pressure
Boiling begins when vapour bubbles can form throughout the liquid and their pressure can resist the pressure outside the liquid. This occurs when the liquid’s vapour pressure becomes equal to the external pressure. The boiling temperature therefore depends on both the liquid and the surrounding pressure; lowering external pressure lowers the boiling point. Colour change, zero volume, or absence of solute is not the defining condition.
Frequently asked questions
What is the correct answer to this question?
When its vapour pressure becomes equal to the external pressure
Why is this the correct answer?
Boiling begins when vapour bubbles can form throughout the liquid and their pressure can resist the pressure outside the liquid. This occurs when the liquid’s vapour pressure becomes equal to the external pressure. The boiling temperature therefore depends on both the liquid and the surrounding pressure; lowering external pressure lowers the boiling point. Colour change, zero volume, or absence of solute is not the defining condition.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Equilibrium. Topic: Equilibrium in physical and chemical processes.
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