Relationship between Equilibrium Constant (K), Reaction Quotient (Q) and Gibbs Energy (G)

IMPORTANT

Relationship between Equilibrium Constant (K), Reaction Quotient (Q) and Gibbs Energy (G): Overview

This topic covers the concept Relationship between Equilibrium Constant (K), Reaction Quotient (Q) and Gibbs Free Energy Change (ΔG).

Important Questions on Relationship between Equilibrium Constant (K), Reaction Quotient (Q) and Gibbs Energy (G)

MEDIUM
IMPORTANT

The Haber’s process for the formation of  NH 3 at 298 K is N2+3H22NH3;ΔH=46.0KJ. Which of the following is the correct statement?

MEDIUM
IMPORTANT

Consider the curve between ln K and 1/T. Which plot will be correct for exothermic reaction?

HARD
IMPORTANT

The ionisation constant of NH4+ in water is 5.6×10-10 at 25°C. The rate constant for the reaction of NH4+ and OH- to form NH3 and H2O at 25°C is 3.4×1010 L mol-1sec-1. If dissociation constant of water at 25°C is 1.8×10-16. If Kw of water at 60°C is 9.5×10-14, then the heat of neutralisation is:

EASY
IMPORTANT

The change in standard Gibbs energy for a reaction at equilibrium, $eg . \mathrm{PCl}_{5}(g) \rightleftharpoons \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g),$ on addition of an inert gas at constant pressure and then at constant volume respectively are :

MEDIUM
IMPORTANT

5 moles of N2O4 taken in a one litre flask dissociates to 20% extent to reach equilibrium. What is ΔG° of the reaction ?

N2O4(g)2NO2(g)

MEDIUM
IMPORTANT

MCO3 (s)MO (s)+CO2 (g) the equilibrium pressure of CO2 at 127oC and 147oC are 0.14 and 0.35 bar respectively. Then :

 

HARD
IMPORTANT

Consider the reaction :

AB         ΔHf kJ              SJK1

A               24.27                246.4

B               25.44               252.3

Then the composition of the equilibrium mixture at 25oC is

EASY
IMPORTANT

The equilibrium constant for a reaction is 10. ΔGo will be R=8JK-1mol-1,T=300K

MEDIUM
IMPORTANT

What are the values of Go and the equilibrium constant for the formation of NO2 from NO and O2 at 298 K. Given log1.365×106=6.14

NOg+12O2NO2g where Gfo=52.0 kJ/mol 

Gro(NO)=87.0 kJ/mol

GroO2=0 kJ/mol

EASY
IMPORTANT

Calculate Kp for the reaction

32O2gO3(g) at 298 K .DGo for the reaction is 163.43 kJ mol-1 is

MEDIUM
IMPORTANT

Which of the following statements is correct for a reversible process in a state of equilibrium?

MEDIUM
IMPORTANT

A schematic plot of lnKeq versus 1T for a reaction is shown below:

Question Image

The reaction must be:

HARD
IMPORTANT

The value of  logKc for a reaction  AB is?

(Given, rH° 298 K=-54.07 kJ mol-1, rS° 298 K=10 JK-1 mol-1 and R=8.314 JK-1 mol-1 2.303×8.314×298=5705)

MEDIUM
IMPORTANT

The standard entropies of X2, Y2 and XY3 are 60, 40 and 50 J K-1 mol-1, respectively. For the reaction 12X2+32Y2XY3, ΔH=-30 kJ, to be at the equilibrium, the temperature should be

HARD
IMPORTANT

For the equilibrium at 298 K, N2O4g2NO2gGN2O4o=100 kJ mol-1 and GNO2o=50 kJ mol-15 moles of N2O4 and 2 moles of NO2 are taken initially in a one-litre container, then, which statements are correct?

HARD
IMPORTANT

The correct statement regarding a reversible system is (are):

HARD
IMPORTANT

The equilibrium constant of the following reaction in equilibrium at 2 7 C  
A + B C + D   is 10
Which of the following statements are correct?

MEDIUM
IMPORTANT

Which of the following statements is true? 

MEDIUM
IMPORTANT

For a given reaction, K=1·7×107 at  2 5 C .
Ag+aq+2NH3aqAgNH32+
What is the value of Δ G in kJ?