For the equilibrium reaction, LiCl . 3 NH 3 ( s ) ⇌ LiCl . NH 3 ( s ) + 2 NH 3 K P = 9 atm 2 , at 40 ° C . A 5 L vessel contains 0 . 1 mole of LiCl NH 3 . How many moles of NH 3 should be added to the flask at this temperature to drive the backward reaction for completion?

LiCl . 3 NH 3 ( s ) ⇌ LiCl . NH 3 ( s ) + 2 NH 3 { K P = 9 atm 2 } If we reverse the reaction, K P will also reverse. Let a be the initial moles taken of NH 3 . LiCl . 3 NH 3 ( s ) + 2 NH 3 ⇌ LiCl . 3 NH 3 ( s ) K P ' = 1 9 atm 2 Initial mole 0 . 1 a 0 Final mole 0 a - 0 . 2 0 . 1 At equilibrium, K P ' = 1 ( P NH 3 ' ) 2 ⇒ 1 9 = 1 ( P NH 3 ' ) 2 ⇒ ( P NH 3 ' ) 2 = 9 ⇒ P NH 3 ' = 3 . PV = nRT ⇒ 3 × 5 = n × 0 . 0821 × 313 ⇒ 15 = n × 25 . 619 ⇒ n = 0 . 5837 . But n is the final moles of NH 3 . n = a - 0 . 2 ⇒ a = n + 0 . 2 ⇒ a = 0 . 5837 + 0 . 2 ⇒ a = 0 . 7837 . An initial mole of NH 3 is 0 . 7837 moles.

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The reactions in which the yield of the products cannot be increased by applying high pressure are

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Important Questions on Chemical Equilibrium

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.3>Q 17

For the reaction:

{PCl}_{5} (g) ⇌ {PCl}_{3} (g) + {Cl}_{2} (g)

The forward reaction at constant temperature is favoured by

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.3>Q 18

For the reaction,

2 A (g) + B (g) ⇌ 2 C (g), ΔH = + 13.6 kJ

, which of the following will increase the extent of the reaction at equilibrium?

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.4>Q 1

The degree of dissociation of

N_{2} O_{4}

into

{NO}_{2}

at one atmospheric pressure and

313 K

0.310

. Calculate

K_{p}

of the dissociation reaction at this temperature. What will be the degree of dissociation at

10

atmospheric pressure at the same temperature?

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IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.4>Q 2

77 ° C

and one atmospheric pressure,

N_{2} O_{4}

70 %

dissociated into

{NO}_{2}

. What will be the volume occupied by the mixture under these conditions, if we start with

10 g

N_{2} O_{4} ?

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.4>Q 3

For the equilibrium reaction,

LiCl . 3 {NH}_{3} (s) ⇌ LiCl . {NH}_{3} (s) + 2 {NH}_{3}

K_{P} = 9 {atm}^{2},

40 ° C .

5 L

vessel contains

0.1 mole

LiCl

{NH}_{3} .

How many moles of

{NH}_{3}

should be added to the flask at this temperature to drive the backward reaction for completion?

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.4>Q 4

At temperature

T,

the compound

{AB}_{2} (g)

dissociates according to the reaction;

2 {AB}_{2} (g) ⇌ 2 AB (g) + B_{2} (g)

.
With a degree of dissociation

x,

which is small compared with unity. Deduce the expression for

x

in terms of the equilibrium constant,

K_{p}

and the total pressure,

P

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.4>Q 5

Vapour density of the equilibrium mixture of ${NO}_{2}$ and $N_{2} O_{4}$ is found to be $38.33$ : For the equilibrium $N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g)$ .

Calculate the abnormal molecular weight.

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Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 6 - Chemical Equilibrium>DPP 6.4>Q 5

Vapour density of the equilibrium mixture of ${NO}_{2}$ and $N_{2} O_{4}$ is found to be $38.33$ : for the equilibrium $N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g)$ .

Calculate: degree of dissociation.

The reactions in which the yield of the products cannot be increased by applying high pressure are

Important Questions on Chemical Equilibrium

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