DAPZOI
Home Ask MCQ Quiz Topics Login

Linnea Asked :

29-05-2021 Vapor Pressure

Q. Which of the following is true about vapor pressure of a liquid?

A. Vapor pressure is closely related to molecular activity but independent of the temperature of the liquid
B. Vapor pressure is not affected by molecular activity and temperature of the liquid
C. Vapor pressure is not affected by molecular activity and is independent of the temperature of the liquid
D. Vapor pressure is closely related to molecular activity and temperature of the liquid





DapzoiVerified
Commented on 2021-05-29
Answer: D

Explanation: The vapor pressure of a liquid at a given temperature is given by the pressure exerted by the saturated vapor on the liquid surface. When the vapor is saturated, an equilibrium exists between the liquid and the vapor phases. The number of molecules leaving the liquid surface is equal to the number of molecules entering the liquid surface. Hence, it is obvious that vapor pressure will be related to molecular activity and consequently to temperature. With the increase in temperature molecular activity increases as a result of which vapor pressure increases.

Submit Your Comment

* You must be logged in to add answer.



Related MCQs:

Which of the following statement is true about vapor pressure of a liquid?

Equal amount of a particular liquid is poured into three similar containers, namely 1, 2 and 3, at a temperature of T1, T2 and T3 respectively. If T1 < T2 < T3, the liquid in which container will have the highest vapor pressure?

Vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature in a closed system.

The absolute pressure of a water is 0.5kN above it’s vapor pressure. If it flows with a velocity of 1m/s, what will be the value of Cavitation Number describing the flow induced boiling?

The three liquids 1, 2, and 3 with vapor pressures V1, V2 and V3 respectively, are kept under same pressure. If V1 > V2 > V3, which liquid will start boiling early?