Factors Affecting Equilibria

IMPORTANT

Factors Affecting Equilibria: Overview

This Topic covers sub-topics such as Le Chatelier's Principle, Factors Affecting Equilibrium, Effect of Temperature on Equilibrium, Effect of Inert Gas on Equilibrium, Effect of Catalyst on Equilibrium and, Applications of Le Chatelier's Principle

Important Questions on Factors Affecting Equilibria

EASY
IMPORTANT

Consider the following equilibrium in a closed container

  N 2 O 4 ( g )2N O 2 ( g )

At a fixed temperature, the volume of the reaction container is halved. For this change, which of the following statements holds true regarding the equilibrium constant   K p and degree of dissociation ( α ) ?

EASY
IMPORTANT

For the chemical reaction  3X(g)+Y(g)X3Y(g) , the amount of   X 3 Y at equilibrium is affected by –

MEDIUM
IMPORTANT

In which of the following equilibrium, change in the volume of the system does not alter the number of moles –

EASY
IMPORTANT

The exothermic formation of ClF3 is represented by the reaction
Cl2( g)+3 F2( g)  2ClF3 g;  H=-329 kJ
Which of the following will increase the quantity of ClF3 in an equilibrium mixture of  Cl2, F2 and ClF3?

MEDIUM
IMPORTANT

At the equilibrium of the reaction, 2 X (g) + Y (g)X2Y (g), the number of moles of X2Y at equilibrium is affected by the

EASY
IMPORTANT

Which of the following reactions will not get affected on increasing the pressure?

EASY
IMPORTANT

Consider the following reaction CaCO3( s)CaO(s)+CO2(g) in closed container at equilibrium. What would be the effect of addition of CaCO3 on the equilibrium concentration of CO2?

MEDIUM
IMPORTANT

Which of the following statements are correct for the reaction SO2Cl2gSO2g+Cl2g, at 500 K ?
a) Kp>Kc
b) Rate of the forward reaction increases with increasing pressure. 
c) Rate of the forward reaction increases on removing Cl2 gas. 
d) Rate of the forward reaction increases with decreasing pressure. 

EASY
IMPORTANT

For the following reversible reaction,

N2g+3H2g2NH3g; ΔHf=-92 kJ/mol.

HARD
IMPORTANT

Aqueous solution of ferric nitrate when mixed with aqueous solution of potassium thiocyanate gives red colour solution. The intensity of red colour becomes constant on attaining equilibrium.

Choose the correct statement when the following chemical is added to the above solution at equilibrium
(i) Oxalic acid
(ii) Mercuric chloride

MEDIUM
IMPORTANT

At the equilibrium of the reaction, 2 X (g) + Y (g)X2Y (g), the number of moles of X2Y at equilibrium is affected by the

MEDIUM
IMPORTANT

What would happen to a reversible dissociation reaction at equilibrium when an inert gas is added while the pressure remains unchanged? Here n >0

HARD
IMPORTANT

The reaction N2 (g) + 3H2 (g)  2NH3 (g) is in equilibrium. Now the reaction mixture is compressed to half the volume

EASY
IMPORTANT

From the following graph represents:

Question Image

EASY
IMPORTANT

By adding inert gas at a constant volume, which of the following equilibrium will not be affected?

EASY
IMPORTANT

For the equilibrium: PCl5(g)PCl3(g)+Cl2(g) 

What will be the concentration of Cl2(g), if the equilibrium concentration of PCl5(g) is doubled?

HARD
IMPORTANT

In a closed vessel, NaNO3 is heated. O2 is liberated and NaNO2 is left behind. At equilibrium

(i) Addition of NaNO3, favours forward reaction.

(ii) Addition of NaNO2, favours backward reaction.

(iii) Increasing pressure favours reverse reaction.

(iv) Increasing temperature favours forward reaction.

Which one of the following is the correct option?

MEDIUM
IMPORTANT

Which of the following statements is incorrect with respect to the given spontaneous 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:

HARD
IMPORTANT

Match the following (There may be one or more correct choices)

   Column-I   Column-II
A H2g+I2g2HIg P Is unaffected by the inert gas addition
B CaCO3sCaOs+CO2g Q The forward shift by rise in the pressure and backward shift by the addition of the inert gas at constant pressure
C N2g+3H2g2NH3g R Is unaffected by the increase in pressure
D PCl5gPCl3g+Cl2g S The backward shift by rise in pressure and forward shift by inert gas addition at constant pressure