The boiling point of liquid A, B, C and D are $80^{o} C, 60^{o} C, 90^{o} C$ and $100^{o} C$ respectively. Which will show highest vapour pressure at room temperature?

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Solution

The correct option is C B
Vapour pressure or equilibrium vapour pressure is defined as the pressure exerted by a vapour in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system.

The equilibrium vapour pressure is an indication of a liquid's evaporation rate. Thus it is related to the ease of vapour formation.

Higher is the boiling point difficult is the vapourization thus lower is the vapour pressure or vice-versa.

Among A, B, C, D lowest boiling point is for B i.e $60^{\circ} C$ thus will have the highest vapour pressure at room temperature.

Therefore, option B is correct.

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The boiling point of liquid A, B, C and D are 80oC,60oC,90oC and 100oC respectively. Which will show highest vapour pressure at room temperature?

The boiling point of liquid A, B, C and D are $80^{o} C, 60^{o} C, 90^{o} C$ and $100^{o} C$ respectively. Which will show highest vapour pressure at room temperature?