Free Energy Change and Chemical Equilibrium
Free Energy Change and Chemical Equilibrium: Overview
This topic covers concepts, such as, Gibbs Free Energy and Spontaneity, Gibbs Free Energy, Condition for Endothermic Spontaneous Process & Condition for Endothermic Non-spontaneous Process etc.
Important Questions on Free Energy Change and Chemical Equilibrium
The correct relationship between free energy and equilibrium constant K of a reaction is:

Consider the following reaction occurring in automobile
the sign of would be:

Match list-I (Equations) with List-II (Type of processes) and select the correct option.
List I | List II | ||
Equations | Type of processes | ||
(1) | Kp > Q | (i) | Non spontaneous |
(2) | (ii) | Equilibrium | |
(3) | Kp = Q | (iii) | Spontaneous and endothermic |
(4) | (iv) | Spontaneous |

A chemical reaction will be spontaneous if it is accompanied by a decrease of

Identify the correct statement for change of Gibb’s energy for a system at constant temperature and pressure:

The enthalpy and entropy change for the reaction
are respectively. The temperature at which the reaction will be in equilibrium is

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?

Standard enthalpy and standard entropy changes for the oxidation of ammonia at are respectively. The standard Gibbs energy change for the same reaction at is:

The entropy change in the fusion of one mole of a solid melting at (Latent heat of fusion, ) is:

What is the value of at high temperature for exothermic non-spontaneous process?

Which of the following condition is favourable for exothermic non-spontaneous process?

For an exothermic non-spontaneous process :

What is the effect of temperature on exothermic non-spontaneous reaction?

What is the condition for non-spontaneous exothermic reaction?

The maximum work (in ) that can be derived from complete combustion of mole of at and is [Standard enthalpy of combustion of ; standard molar entropies at ]

Which condition among the following holds true at the stage of half-completion for the reaction

The boiling point of water at is Which among the following is true for vaporization of water at

For the process
, the correct set of thermodynamic parameters is

A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following:

For the reaction and are respectively:
