When a liquid is heated in a closed container, the temperature at which boundary between gaseous and liquid phases disappears is called

critical temperature

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boiling point

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freezing point

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Solution

The correct option is A critical temperature
Boiling point of a liquid is the temperature at which vapour pressure of the liquid is equal to external pressure on the liquid.

Freezing point of a liquid is the temperature at which the liquid and solid phases of the liquid are at equilibrium.

Critical temperature is the temperature at which boundary between vapour and liquid phases of liquid disappears when the liquid is heated in a closed vessel.

Therefore critical temperature is the correct answer.

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Similar questions

Q. Why does the boundary between liquid phase and gaseous phase disappear on heating a liquid upto? Critical temperature in a closed vessel ?

Why does the boundary between liquid phase and gaseous phase disppear on heating a liquid upto critical temperature in a closed vessel ? In this situation what will be the state of the substance?

Q. Assertion :Meniscus of a liquid disappears at critical temperature. Reason: Density of a liquid and its gaseous phase become equal at the critical temperature.

Q. Two compounds A and B in when mixed form nearly ideal solutions. At room temperature,

P_{A}^{0} = 40 m m H g

and

P_{B}^{0} = 120 m m H g

.
A liquid mixture is composed of

1 m o l

of A and

3 m o l

of B.
When the last trace of liquid disappears, choose the correct option(s) regarding composition of A and B in liquid phase :
Here,

x_{A} = Composition of A in liquid phase when fthe last trace of liquid disappears

x_{B} = Composition of B in liquid phase when the last trace of liquid disappears

The temperature at which a liquid changes into its gaseous form is called _________.

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