Free Energy Change and Chemical Equilibrium

IMPORTANT

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

MEDIUM
IMPORTANT

The correct relationship between free energy and equilibrium constant K of a reaction is:                              

MEDIUM
IMPORTANT

Consider the following reaction occurring in automobile

2C8H18+25O2g16CO2g+18H2Og

the sign of  ΔH,  ΔS  and  ΔG would be:

EASY
IMPORTANT

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) Δ G o < RTInQ (ii) Equilibrium
(3) Kp = Q (iii) Spontaneous and endothermic
(4) T > Δ H Δ S (iv) Spontaneous

EASY
IMPORTANT

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

                               

MEDIUM
IMPORTANT

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

                               

EASY
IMPORTANT

The enthalpy and entropy change for the reaction

  B r 2 (l)+C l 2 (g)2BrCl(g)

are   30kJmo l 1 and105J K 1 mo l 1  respectively. The temperature at which the reaction will be in equilibrium is

                               

MEDIUM
IMPORTANT

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

MEDIUM
IMPORTANT

Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64kJmol1  and  145.6JK1mol1,  respectively. The standard Gibbs energy change for the same reaction at 298 K is:

                               

EASY
IMPORTANT

The entropy change in the fusion of one mole of a solid melting at  27°C (Latent heat of fusion,  2930Jmol1) is:

                               

MEDIUM
IMPORTANT

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

MEDIUM
IMPORTANT

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

HARD
IMPORTANT

For an exothermic non-spontaneous process : 

MEDIUM
IMPORTANT

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

HARD
IMPORTANT

What is the condition for non-spontaneous exothermic reaction?

MEDIUM
IMPORTANT

The maximum work (in kJ mol-1) that can be derived from complete combustion of 1 mole of CO at 298 K and 1 atm is [Standard enthalpy of combustion of CO=-283.0 kJ mol-1; standard molar entropies at 298 K: SO2=205.1 J mol-1, SCO=197.7 J mol-1. SCO2=213.7 J mol-1]

MEDIUM
IMPORTANT

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

EASY
IMPORTANT

The boiling point of water at 1 atm is 100°C. Which among the following is true for vaporization of water at 75°C ?

MEDIUM
IMPORTANT

For the process

H2Ol1 bar, 373 KH2O(g)(1 bar, 373 K) , the correct set of thermodynamic parameters is

EASY
IMPORTANT

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:

MEDIUM
IMPORTANT

For the reaction 2O33O2, ΔH, ΔS and G are respectively: