Graph of a reversible process; N 2 + 3 H 2 ⇌ 2 NH 3 + Heat is given. Analyse the graph and answer the following question. Identify the part of the graph which represents the forward reaction [ OA, BA, AC]

BA part of the graph represents the forward reaction. The forward reaction speeds up temporarily as a result of the addition of reactants. The position of equilibrium shifts as more ammonia ( NH 3 ) is produced. The concentration of ammonia increases, while the concentration of N 2 and H 2 decreases. The forward reaction in the production of ammonia is exothermic.

If the value of an equilibrium constant for a particular reaction is 1.6 × 10 12 , then at equilibrium the system will contain:

Similar amounts of reactants and products

EASY

Earn 100

Nitric oxide reacts with ${Br}_{2}$ and gives nitrosyl bromide as per the reaction given below.

$2 NO (g) + {Br}_{2} (g) ⇌ 2 NOBr (g)$

When $0.087$ mole of $NO$ and $0.0437$ mole of ${Br}_{2}$ are mixed in a closed container at a constant temperature, $0.0518$ mole of $NOBr$ is obtained at equilibrium. Calculate the equilibrium amount of $NO$ and ${Br}_{2}$ .

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Important Questions on Equilibrium

HARD

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

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}

EASY

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

Graph of a reversible process;

$N_{2} + 3 H_{2} \overset{}{⇌} 2 {NH}_{3} + Heat$

is given. Analyse the graph and answer the following question.

Question Image

Identify the part of the graph which represents the forward reaction

[ OA, BA, AC]

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

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:

EASY

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

If the equilibrium constant for

N_{2} (g) + O_{2} (g) ⇌ 2 N O (g)

is K, the equilibrium constant for

\frac{1}{2} N_{2} (g) + \frac{1}{2} O_{2} (g) ⇌ N O (g)

will be:

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

Using the data provided, find the value of equilibrium constant for the following reaction at $298 K$ and $1$ atm pressure. ${NO}_{(g)} + \frac{1}{2} O_{2} (g) ⇌ {NO}_{2} (g)$
$Δ_{f} H^{0} ({NO}_{(g)}) = 90 .4 kJ . {mol}^{- 1}$

$Δ_{f} H^{0} ({NO}_{2} (g)) = 32 .48 kJ \cdot {mol}^{- 1}$

${ΔS}^{\circ} at 298 K = - 70 .8 J \cdot K^{- 1} \cdot {mol}^{- 1}$

$antilog (0 .50) = 3162$

HARD

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

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>Chemical Equilibrium and its Characteristics

Chemical equilibrium is possible only in _____ vessel.

HARD

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

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)

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

The equilibrium constant for the reaction is

P_{4} (s) + 50_{2} (g) ⇌ P_{4} 0_{10} (s)

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

Which one of the following is NOT an example of heterogeneous equilibrium?

HARD

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

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>Chemical Equilibrium and its Characteristics

Among the following, the correct statement about the chemical equilibrium is.

EASY

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

If the value of an equilibrium constant for a particular reaction is

1.6 \times 10^{12}

, then at equilibrium the system will contain:

EASY

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

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:

HARD

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

The thermal dissociation equilibrium of

{CaCO}_{3} (s)

is studied under different conditions.

{CaCO}_{3} (s) ⇌ CaO (s) + {CO}_{2} (g)

For this equilibrium, the correct statement(s) is/are

EASY

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

For the reaction

{SO}_{2} (g) + \frac{1}{2} O_{2} (g) ⇌ {SO}_{3} (g)

, if

K_{P} = K_{C} {(RT)}^{x}

where the symbols have usual meaning then the value of

x

is:
(assuming ideality)

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

The equilibrium constants of the following are:

\begin{matrix} N_{2} + 3 H_{2} ⇌ 2 {NH}_{3} & K_{1} \\ N_{2} + O_{2} ⇌ 2 NO & K_{2} \\ H_{2} + \frac{1}{2} O_{2} \to H_{2} O & K_{3} \end{matrix}

The equilibrium constant (

K

) of the reaction:

2 N H_{3} + \frac{5}{2} O_{2} \overset{K}{⇌} 2 N O + 3 H_{2} O

, will be:

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

Graph of a reversible process,

Question Image

is given. Analyse the graph and answer the following question.

Question Image

From the given statements, select the correct ones regarding chemical equilibrium.

(i0 The chemical equilibrium is 'static' at the molecular level.

(ii) Both reactants and products co-exist.

(iii) The rates of forward reaction and backward reactions are equal.

(iv) Chemical equilibrium is attained in an open system.

EASY

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

There are two statements, one labelled as Assertion (A) and the other as Reason (R). Examine both the statements carefully and mark the correct choice.

(A)

At equilibrium, the mass of each of the reactants and products remains constant.

(R)

At equilibrium, the rate of forward reaction is equal to the rate of backward reaction.

EASY

Chemistry>Physical Chemistry>Equilibrium>Chemical Equilibrium and its Characteristics

For the equilibrium

A ⇌ B

, the variation of the rate of the forward (a) and reverse (b) reaction with time is given by:

Important Questions on Equilibrium

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