Law of Chemical Equilibrium and Equilibrium Constants

IMPORTANT

Law of Chemical Equilibrium and Equilibrium Constants: Overview

This topic covers concepts, such as, Assumption of Pure Solids in Heterogenous Equilibrium, Law of Mass Action, Equilibrium Constant in Terms of Concentration(Kc) & Equilibrium Constant in Terms of Mole Fraction(Kx) etc.

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?

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:

MEDIUM
IMPORTANT

The Haber’s process for the formation of   NH 3 at 298 K is

 N2+3H22NH3;ΔH=46.0J.

Which of the following is the correct statement –

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 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

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 –

HARD
IMPORTANT

COF2 gas passed over a catalyst at 1000 °C comes to equilibrium:

2COF2 (g)CO2 (g)+CF4 (g)

Analysis of the equilibrium mixture (after quick cooling to freeze the equilibrium) shows that 500 mL of the equilibrium mixture (NTP) contains 300 mL (NTP) of COF2 and CO2. Taking the total pressure to be 10 atm, calculate Kp.

MEDIUM
IMPORTANT

Derive the equilibrium constant in terms of mole fraction for a given reaction.

aA  bB

EASY
IMPORTANT

The equilibrium constant in terms of mole fraction is represented as

EASY
IMPORTANT

Define equilibrium constant in terms of mole fraction.

EASY
IMPORTANT

If one-third of HI decomposes at a particular temperature, the value of equilibrium constant Kc for 2HIH2+I2 is

MEDIUM
IMPORTANT

1 L vessel contains 2 mol each of gases A, B, C and D at equilibrium. If 1 mol each of A and B are removed, Kc for A+BC+D will be

MEDIUM
IMPORTANT

If the equilibrium constants of the following equilibriums SO2+12O2SO3 and 2SO32SO2+O2 are given by K1 and K2, respectively, which of the following relations is correct?

HARD
IMPORTANT

For a reaction NH4COONH2(s)2NH3(g)+CO2(g), the equilibrium pressure is 3 atm. Kp for the reaction will be _____atm3.

MEDIUM
IMPORTANT

1 mole of NO and 1 mole of O3 are taken in a 10L vessel and heated. At equilibrium, 50% of NO (by mass) reacts with O3 according to the equation:
NO(g)+O3(g)NO2(g)+O2(g)
What will be the equilibrium constant for this reaction?

EASY
IMPORTANT

In the relation, Kp=Kc(RT)Δn the value of Δn is number of moles of gaseous products - number of moles of gaseous reactants in a balanced equation.