Law of Chemical Equilibrium and Equilibrium Constants

IMPORTANT

Law of Chemical Equilibrium and Equilibrium Constants: Overview

This Topic covers sub-topics such as Law of Mass Action, Equilibrium Constant, Active Mass, Equilibrium Equation, Forward Rate Constant, Equilibrium Law or Law of Chemical Equilibrium and, Backward Rate Constant

Important Questions on Law of Chemical Equilibrium and Equilibrium Constants

EASY
IMPORTANT

At constant temperature, the equilibrium constant  (Kp) for the decomposition reaction  N2O4(g)2NO2(g)  is expressed by Kp=4x21-x2P , where P = pressure, x = extent of decomposition. Which one of the following statements is true?

MEDIUM
IMPORTANT

At constant temperature, the equilibrium constant   ( K p ) for the decomposition reaction  N2O4(g)2NO2(g)  is expressed by kp=(4x2P)(1-x2) , where P = pressure, x = extent of decomposition. Which one of the following statements is true?

EASY
IMPORTANT

When two reactants, A and B are mixed to give products C and D, the reaction quotient Q, at the initial stage of the reaction :–

MEDIUM
IMPORTANT

For the reversible reaction,  N2(g)+3H2g2NH3(g) at 500°C, the value of  Kp is   1.44× 10 5 when partial pressure is measured in the atmosphere. The corresponding value of  Kc, with concentration in mol L-1, is: 

MEDIUM
IMPORTANT

For the reversible reaction N2(g)+3H2(g)2NH3(g) at 500°C , the value of Kp is  1.44× 10 5 when partial pressure is measured in atmosphere. The corresponding value of Kc, with concentration in mol litre-1, is:

HARD
IMPORTANT

When 3.06 g of solid   NH 4 HS  is introduced into a two litre evacuated flask at   27°C,30% of the solid decomposes into gaseous ammonia and hydrogen sulphide.

The values of   K c  and   K p  for the reaction at 27°C   respectively will be:

EASY
IMPORTANT

When two reactants A and B are mixed to give products C and D, the reaction quotient Q at the initial stage of the reaction is best described by-

MEDIUM
IMPORTANT

For the reversible reaction, N2(g)+3H2(g)2NH3(g) at 500°C , the value of Kp is 1.44× 10 5 , when partial pressure is measured in the atmosphere. The corresponding value of Kc, with the concentration in mole litre-1, is

EASY
IMPORTANT

For the reversible reaction,   N 2 ( g )+3 H 2 (g)2N H 3 ( g ) at 500°C , the value of   K p is   1.44× 10 5 when partial pressure is measured in atmosphere. The corresponding value of   K c , with concentration in mole litre -1 , is –

MEDIUM
IMPORTANT

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

EASY
IMPORTANT

What is the equilibrium expression for the reaction,   P 4 (s) + 5O 2 (g)   P 4 O 10 (s) ?

EASY
IMPORTANT

For the reaction equilibrium,   N 2 O 4 (g)   2NO 2 (g) the concentrations of   N 2 O 4 and   NO 2 at equilibrium are   4.8×1 0 -2 and1.2×1 0 -2 mol L -1 respectively. The value of Kc for the reaction is –

MEDIUM
IMPORTANT

State and explain the law of mass action. Apply it to the following equilibria: PCl5sPCl3l+Cl2g.

MEDIUM
IMPORTANT

State and explain the law of mass action. Apply it to the following equilibria: NH4HSsNH3g+H2Sg.

MEDIUM
IMPORTANT

State and explain the law of mass action. Apply it to the following equilibria: H2g+F2g2HFg.

MEDIUM
IMPORTANT

One mole of PCl5 is subjected to heating in a 1 L vessel. The number of moles of PCl3 formed at equilibrium is 0.6. Calculate the equilibrium constant for the dissociation of PCl5.

MEDIUM
IMPORTANT

Calculate Kp if the partial pressures of reactants and products in the dissociation of 1 mole of phosphorous pentachloride are 0.3 atm, 0.4 atm, and  0.2 atm respectively.

EASY
IMPORTANT

Give the units of Kc for the formation of 1 mole of NH3 from its constituents.

EASY
IMPORTANT

Write the equilibrium constant for the dissociation of CaCO3.

MEDIUM
IMPORTANT

The value of Kc is 64 at 800 K for the reaction

N2(g)+3H2(g)2NH3(g)

The value of Kc, for the following reaction is:

NH3(g)12N2(g)+32H2(g)