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For a particular reaction if $K_{p} > K_{c}$ then the forward reaction is favoured by

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Important Questions on Equilibrium

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Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

Consider the nitration of benzene using mixed conc.

H_{2} S O_{4}

and

H N O_{3}

. If a large amount of

K H S O_{4}

is added to the mixture, the rate of nitration will be:

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

4.0

moles of argon and

5.0

moles of

{PCl}_{5}

are introduced into an evacuated flask of

100

litre capacity at

610 K

. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be

6.0 atm

. The

K_{p}

for the reaction is [Given :

R = 0.082 L

atm

K^{- 1} {mol}^{- 1}

]

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

The standard Gibbs energy change at 300 K for the reaction

2 A ⇌ B + C

is 2494.2 J. At a given time, the composition of the reaction mixture is

[A] = \frac{1}{2}, [B] = 2

and

[C] = \frac{1}{2}

. The reaction proceeds in the:

[R = 8.314 J / K - m o l, e = 2.718]

{Given antilog (-0.44)=0.36}

EASY

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

Consider the following reversible chemical reactions:

A_{2} (g) + B_{2} (g) \overset{k_{1}}{⇌} 2 A B (g)

.....(1)

6 A B (g) \overset{k_{2}}{⇌} 3 A_{2} (g) + 3 B_{2} (g)

.....(2)

The relation between

K_{1}

and

K_{2}

is:

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

60 ° C

, dinitrogen tetroxide is fifty percent dissociated. Find its standard free energy change at this temperature and one atmosphere. [ Given:

\log 1.33 = 0.1239

]

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

What are the values of

\frac{K_{p}}{K_{c}}

for the following reactions at

300 K

respectively?

(At

300 K, RT = 24 .62 {dm}^{3} atm {mol}^{- 1}

)

N_{2} (g) + O_{2} (g) ⇌ 2 NO (g); \frac{K_{p}}{K_{c}} = x_{1}

N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g); \frac{K_{p}}{K_{c}} = x_{2}

N_{2} (g) + 3 H_{2} (g) ⇌ 2 {NH}_{3} (g); \frac{K_{p}}{K_{c}} = x_{3}

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

A homogeneous ideal gaseous reaction

{AB}_{2 (g)} ⇌ A_{(g)} + 2 B_{(g)}

is carried out in a

25 litre

flask at

27 ° C

. The initial amount of

{AB}_{2}

was

1

mole and the equilibrium pressure was

1.9 atm

. The value of

K_{p}

x \times 10^{- 2}

. The value of

x

is (Integer answer)

[R = 0.08206 {dm}^{3} atm K^{- 1} {mol}^{- 1}]

EASY

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

The reaction

C_{2} H_{6} (g) ⇌ C_{2} H_{4} (g) + H_{2} (g)

is at equilibrium in a closed vessel at 1000 K. The enthalpy change

(∆ H)

for the reaction is

137.0 k J m o l^{- 1}

. Which one of the following actions would shift the equilibrium to the right?

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

For the reaction

A_{(g)} ⇌ B_{(g)} + C_{(g)}, A

33 %

dissociated at a total pressure

P .

The correct relation between

P

and

K_{p}

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Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

For the reaction

$H_{2 (g)} + {CO}_{2 (g)} ⇌ {CO}_{(g)} + H_{2} O_{(g)},$ if the initial concentration of $[H_{2}] = [{CO}_{2}] = 1 M$ and $x$ moles $/ L$ of $H_{2}$ is consumed at equilibrium, the correct expression of $K_{P}$ is.

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

5 .1 g {NH}_{4} SH

is introduced in

3 .0 L

evacuated flask at

327^{o} C

30 %

of the solid

{NH}_{4} SH

is decomposed to

{NH}_{3}

and

H_{2} S

as gases. The

K_{P}

of the reaction at

327^{o} C

(R = 0 .082 L atm {mol}^{- 1} K^{- 1}, Molar mass of S = 32 g {mol}^{- 1}, Molar mass of N = 14 g {mol}^{- 1})

EASY

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

For

{NH}_{4} HS (s) ⇌ {NH}_{3} (g) + H_{2} S (g)

the
observed pressure for the reaction mixture in equilibrium is

1.12 atm

106 ° C

. What is the value of

K_{p}

for the reaction?

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

Consider an electrochemical cell:

A (s) |A^{n +} (aq, 2 M)| |B^{2 n +} (aq, 1 M)| B (s)

. The value of

{ΔH}^{o}

for the cell reaction is twice that of

{ΔG}^{o}

300 K .

If the emf of the cell is zero, the magnitude of

Δ S^{o}

(in {JK}^{- 1} {mol}^{- 1})

of the cell reaction per mole of

B

formed at

300 K

is ____

{Jmol}^{- 1} K^{- 1}

. (Give answer after rounding off to the nearest integer value.)
(Given: R

= 8.3 {JK}^{- 1} {mol}^{- 1} .

H, S

and

G

are enthalpy, entropy and Gibbs energy, respectively.)

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

In a chemical reaction,

A + 2 B \overset{K}{⇌} 2 C + D

, the initial concentration of

B

was

1.5

times of the concentration of

A

, but the equilibrium concentrations of

A

and

B

were found to be equal. The equilibrium constant

(K)

for the chemical reaction is:

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

Gaseous

N_{2} O_{4}

dissociates into gaseous

N O_{2}

according to the reaction

N_{2} O_{4} (g) ⇌ 2 N O_{2} (g)

300 K

and

1 atm

pressure, the degree of dissociation of

N_{2} O_{4}

0.2

. If one mole of

N_{2} O_{4}

gas is contained in a vessel, then the density of the equilibrium mixture is

:

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

The percentage of pyridine

(C_{5} H_{5} N)

that forms pyridinium ion

(C_{5} H_{5} N^{+} H)

in a

0.10 M

aqueous pyridine solution

(K_{b} for C_{5} H_{5} N = 1 .7 \times 10^{- 9})

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

Which of the following statements is correct for a reversible process in the state of equilibrium?

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

For a reaction at equilibrium

$A (g) ⇌ B (g) + \frac{1}{2} C (g)$

the relation between dissociation constant $(K)$ , degree of dissociation $(α)$ and equilibrium pressure $(p)$ is given by :

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

A sample of

HI (g)

is placed in a flask at a pressure of

0.2 atm .

At equilibrium, partial pressure of

HI (g)

0.04 atm .

What is

Kp

for the given equilibrium ?

2 HI (g) ⇌ H_{2} (g) + I_{2} (g)

HARD

Chemistry>Physical Chemistry>Equilibrium>Equilibrium Constants and its Significance

20 litre

container at

400 K

contains

{CO}_{2} (g)

at pressure

0.4 atm

and an excess of

SrO

(neglect the volume of solid

SrO

). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when the pressure of

{CO}_{2}

attains its maximum value, will be:

(Given that : {SrCO}_{3} (s) ⇌ SrO (s) + {CO}_{2} (g), K_{p} = 1 .6 atm)

For a particular reaction if Kp>Kc then the forward reaction is favoured by

Important Questions on Equilibrium

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For a particular reaction if $K_{p} > K_{c}$ then the forward reaction is favoured by