For the reaction: 2 NO 2 g ⇌ 2 NO g + O 2 g , K c = 1 .8 × 10 - 6 at 184 o C , R = 0 .0831 J / molK When K p and K c are compared at 184 o C. It is found that

Whether K p is greater than, less than or equal to K c depends upon the total gas pressure.

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Important Questions on Equilibrium

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

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. $K_{p}$ for this reaction is?

HARD

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

$A (g) ⇌ 2 B (g) + C (g)$

For the given reaction, if the initial pressure is $450 mmHg$ and the pressure at time $t$ is $720 mmHg$ at a constant temperature $T$ and constant volume $V$ . The fraction of $A (g)$ decomposed under these conditions is $x \times 10^{- 1}$ . The value of $x$ is (nearest integer)

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

The RMS speed of oxygen at room temperature is about

500 m s^{- 1}

. The RMS speed of hydrogen at the same temperature is about

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

For the reaction:

2 {NO}_{2 (g)} ⇌ 2 {NO}_{(g)} + O_{2 (g)},

(K_{c} = 1 .8 \times 10^{- 6} at 184^{o} C), (R = 0 .0831 J / molK)

When

K_{p}

and

K_{c}

are compared at

184^{o} C.

It is found that

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

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:

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

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:

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

The mean free path of molecules of a gas (radius ‘

r

’) is inversely proportional to:

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

What do you understand by chemical equilibrium? Explain with one suitable example.

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

An example of reversible reaction is

MEDIUM

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

For the synthesis of ammonia by the reaction

N_{2} + 3 H_{2} ⇌ 2 {NH}_{3}

in the Haber's process, the attainment of equilibrium is correctly predicted by the curve

HARD

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

A mixture of

{NO}_{2}

and

N_{2} O_{4}

has a vapour density of

38.3

300 K

. What is the number of moles of

{NO}_{2}

100 g

of the mixture?

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

List any four important characteristics of a chemical equilibrium.

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Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

Among the following points indicated on the graph, which one represents equilibrium?

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

Define 'homogeneous equilibria and heterogeneous equilibria'. Give three examples of each of them.

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

A compound having the formula

{NH}_{2} {CH}_{2} COOH

will behave

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

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}

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

The

{pK}_{a}

of acetyl salicylic acid (aspirin) is 3.5. The pH of gastric juice in human stomach is about 2-3 and pH in the small intestine is about 8. Aspirin will be:

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Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

In the reaction ${PCl}_{5} (g) ⇌ {PCl}_{3} (g) + {Cl}_{2} (g)$ , which of the graphs is/are correct?

Question Image

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

For the reaction $R ⇌ P$ , variation of concentration is plotted against time. The time at which the equilibrium establishes is as shown:

Question Image

Which of the following regions show(s) equilibrium?

EASY

Chemistry>Physical Chemistry>Equilibrium>Applications of Equilibrium Constant

At equilibrium mixture for the reaction

2H₂S ⇌2H₂+ S₂

had 1 mole of H₂S, 0.2 mole of H₂, and 0.8 mole of S₂ in a
2 litre flask. The value of K_cin mol L^-is

In a market with free entry and exit, what happens to economic profits in the long run?

Important Questions on Equilibrium

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