Chemical Equilibrium

The following reaction occurs in the Blast Furnace where iron ore is reduced to iron
metal :
Fe2O3(s) + 3 CO(g) \(\rightleftharpoons\) 2 Fe(1) + 3 CO2(g)
Using the Le Chatelier’s principle, predict which one of the following will not distur...

A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. Kp for this reaction is :

The equilibrium constant at 298 K for a reaction A + B \(\leftrightharpoons\) C + D is 100. If the initial concentration of
all the four species were 1M each, then equilibrium concentration of D (in mol L–1) will be:

The standard Gibbs energy change at 300 K for the reaction 2A \(\leftrightharpoons\) B + C is 2494.2 J. At a given time,
the composition of the reaction mixture is [A] = 1/2, [B] = 2 and [C] = 1/2. The reaction proceeds in the: [R = 8.314 J...

For the reaction SO2 (g) + \({1 \over 2} O_2(g) \leftrightharpoons\) SO3(g).
if KP = KC(RT)x where the symbols have usual meaning then
the value of x is: (assuming ideality)

The equilibrium constant (KC) for the reaction N2(g) + O2(g) \(\to\) 2NO(g) at temperature T is 4 \(\times\) 10–4. The value of KC for the reaction, NO(g) \(\to\) 1/2N2(g) + 1/2O2(g) at the same temperature is :

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on
the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of K is :

In aqueous solution the ionization constants for carbonic acid are
K1 = 4.2 x 10–7 and K2 = 4.8 x 10–11
Select the correct statement for a saturated 0.034 M solution of the carbonic acid.

For the following three reactions a, b and c, equilibrium constants are given:
a. CO (g) + H2O (g) \(\leftrightharpoons\) CO2(g) + H2 (g) ; K1
b. CH4 (g) + H2O (g) \(\leftrightharpoons\) CO(g) + 3H2 (g) ; K2
c. CH4 (g) + 2H2O (g) $$\leftri...

The equilibrium constants KP1 and KP2 for the reactions X \(\leftrightharpoons\) 2Y and Z \(\leftrightharpoons\) P + Q, respectively are in
the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total press...

The equilibrium constant for the reaction
SO3 (g) \(\leftrightharpoons\) SO2 (g) + \(1 \over 2\) O2 (g)
is Kc = 4.9 \(\times\) 10–2. The value of Kc for the reaction
2SO2 (g) + O2 (g) \(\leftrightharpoons\) 2SO3 (g) will be :

Phosphorus pentachloride dissociates as follows, in a closed reaction vessel
PCl5 (g) \(\leftrightharpoons\) PCl3 (g) + Cl2 (g)
If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x, the
part...

An amount of solid NH4HS is placed in a flask already containing ammonia gas at a
certain temperature and 0.50 atm. Pressure. Ammonium hydrogen sulphide
decomposes to yield NH3 and H2S gases in the flask. When the decomposition
reaction rea...

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

For the reaction
2NO2 (g) \(\leftrightharpoons\) 2NO (g) + O2 (g), (Kc = 1.8 \(\times\) 10-6 at 184oC) (R = 0.0831 kJ/(mol. K))
When Kp and Kc are compared at 184oC , it is found that :

For the reaction, CO(g) + Cl2(g) \(\leftrightharpoons\) COCl2(g) the \({{{K_p}} \over {{K_c}}}\) is equal to :

The equilibrium constant for the reaction N2(g) + O2(g) \(\leftrightharpoons\) 2NO(g) at temperature T is
4 \(\times\) 10-4. The value of Kc for the reaction NO(g) \(\leftrightharpoons\) \(1 \over 2\)N2 (g) + \(1 \over 2\)O2 (g) at the same...

What is the equilibrium expression for the reaction
P4 (s) + 5O2 \(\leftrightharpoons\) P4O10 (s)?

For the reaction equilibrium
N2O4 (g) \(\leftrightharpoons\) 2NO2 (g)
the concentrations of N2O4 and NO2 at equilibrium are 4.8 \(\times\) 10-2 and 1.2 \(\times\) 10-2 mol L-1 respectively. The value of Kc for the reaction is

Consider the reaction equilibrium
2 SO2 (g) + O2 (g) \(\leftrightharpoons\) 2 SO3 (g); \(\Delta H^o\) = -198 kJ
One the basis of Le Chatelier's principle, the condition favourable for the forward reaction is :

For the reaction CO (g) + (1/2) O2 (g) \(\leftrightharpoons\) CO2 (g), Kp/Kc is :

Change in volume of the system does not alter which of the following equilibria?