Reversible, Irreversible, Polytropic Process MCQ

Solve by difficulty

MEDIUM

Consider the following liquid-vapour equilibrium.

$Liquid\rightleftharpoons Vapour$

Which of the following relations is correct?

$\frac{dlnG}{dT^2}=\frac{\Delta H_v}{RT^2}$

$\frac{dlnP}{dT}=\frac{-\Delta H_v}{RT}$

$\frac{dlnP}{dT^2}=\frac{-\Delta H_v}{T^2}$

$\frac{dlnP}{dT}=\frac{\Delta H_v}{RT^2}$

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Consider the following liquid-vapour equilibrium

$liquid \rightleftharpoons vapour$

Which of the following relations are correct?

$\frac{dlnG}{dT^{2}}\: =\: \frac{\Delta H_{v}}{RT^{2}}$

$\frac{dlnP}{dT}=\frac{\Delta H_{v}}{RT}$

$\frac{dlnP}{dT^{2}}$ = $\frac{-\Delta H_{v}}{T^{2}}$

$\frac{dlnP}{dT} = \frac{-\Delta H_{v}}{RT^{2}}$

View Solution

Concepts Covered - 2

Reversible, Irreversible, Polytropic Process

Reversible or Quasi-Static Process

It is carried out in such a way that the system remains in a state of equilibrium. All changes occurring at any part of the process will be exactly reversed when the change in carried out in the opposite direction.

It involves slow changes during operation.
This process may occur in any direction.
Here driving force and opposing force differ with each other by a very small value.

Irreversible Process

Here the direction of change can not be reversed by small changes in variables. All processes occurring naturally are reversible

It Involves fast changes during operation.
It is a unidirectional process.
Here, driving and opposing forces differ by a large amount.

Polytropic Process

PV^m = constant is known as general or polytropic process

If m= 0, the process is constant pressure.

If m = I, the process is isothermal.

If m = $\gamma$ , the process is adiabatic.

Thermodynamic Equilibrium

Thermodynamic Equilibrium

A system in which the macroscopic properties do not undergo any change with time is called thermodynamic equilibrium.

If a system is heterogeneous and it is in equilibrium the macroscopic properties in the various phases remain unchanged with time.

Types: It is of three types-

(i) Mechanical Equilibrium

Here no mechanical work is done by one of the systems on another part of the system and it is possible if the pressure remains the same throughout the system that is, there is no flow of matter from one part to another

(ii) Thermal Equilibrium

There is no flow of heat from one part to another that is, the temperature is constant.

(iii) Chemical Equilibrium

There is no change in the composition of any part of the system with time.