Equilibrium 1

These MCQs are intended for checking your Chemistry subject, Chapter Equilibrium knowledge.

Ammonia gas at 76cm Hg pressure was connected to a manometer . After sparking in the flask ammonia partially
dissociated as follows 2NH3 (g) ⇌ N2 (g) + 3H2 (g) The level in the mercury column of the manometer was found to
show the difference of 18cm . The partial pressure of H2 (g) at equilibrium is

20 ml of O2 contracts to 17 ml when subjected to silent electric discharge in an Ozoniser .What is the volume of O2 formed at equilibrium ?

The equilibrium constant for the reaction N2 (g) + O2 (g) ⇌ 2NO(g) is 4 × 10-4 at 2000K . In presence of a catalyst ,
equilibrium is attained ten times faster . Therefore , The Equilibrium constant in presence of the catalyst at 2000K is

In a closed System : A (s) ⇌ 2B(g) + 3C (g) if the partial pressure of C is doubled , then partial pressure of B will be√2

The reactions , PCl5 (g) ⇌ PCl3 (g) + Cl2 (g) and COCl2 (g) ⇌ CO (g) + Cl2 (g) are simultaneously in equilibrium in an Equilibrium box at constant volume . A few moles of CO(g) are later introduced into the vessel . After sometime the new Equilibrium Concentration of

For the gas phase reaction , 2NO (g) ⇌ N2(g) + O2(g) , ∆H = -43.5 K cal , which one of the following is true for
N2(g) + O2(g) ⇌ 2NO(g)

The first and second dissociation constants of an acid H2A are 1.0 × 10-5 and 5.0 × 10-10 respectively. The overall
dissociation constant of the acid will be

For the Equilibrium
H2O (s) ⇌ H2O (l)
Which of the following statement is true ?

In which of the following cases does the reaction go farthest to completion.

Consider the following reaction,
C (s , diamond) ⇌ C (s, graphite) + heat and choose the correct option

For the given reaction 2A(s) + B(g) ⇌ C (g) + 2D (s) + E (s) the degree of dissociation of B was found to be 20% at
300K and 24% at 500K . The rate of forward

At -50℃ , the self ionization constant (ion product) of NH3
is KNH3 = 10-33M2. How many amide ions are present per
mm3 of pure liquid ammonia ?

For a reaction N2 + 3H2 = 2NH3 , the value of Kc would depend upon

The gas A2 in the left flask allowed to react with gas B2 present in right flask as

A2 (g) + B2 (g) ⇌ 2AB (g) ; Kc = 4 at 27℃

What is the concentration of AB when Equilibrium is established ?

The Initial pressure of COCl2 is 1000 torr . The total pressure of the system becomes 1500 torr when the equilibrium
COCl2 (g) ⇌ CO (g) + Cl2 (g) is attained at constant temperature.
The value of Kp of a reaction is

For the equilibrium SO2 (g) + ½ O2(g) ⇌ SO3 (g) ; ∆H = -99.0 KJ. The extent of forward reaction can be increased by

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