Test: Previous Year Questions: Chemical Equilibrium

Question 1

For the reaction

[AIEEE-2002]

Accepted Answer

Answer

Answer

Answer

RT

Question 2

Which of the following equilibria is not affected by change in volume of the flask

[AIEEE-2002]

Accepted Answer

N₂ (g) + O₂(g) 2NO(g)

Answer

PCl₅ (g) PCl₃(g) + Cl₂(g)

Answer

N₂(g) + 3H₂ (g) 2NH₃(g)

Answer

SO₂Cl₂ (g) SO₂(g) + Cl₂(g)

Question 3

For the reaction equilibrium N₂O₄ (g) ⇌ 2NO₂ (g) the concentrations of N₂O₄ and NO₂ at equilibrium are 4.8 × 10^-2 and 1.2 × 10^-2 mol L^-1 respectively. The value of K_C for the reaction is -

[AIEEE-2003]

Accepted Answer

3 ×10^-3 mol L^-1

Answer

3 ×10³ mol L^-1

Answer

3.3 ×10² mol L^-1

Answer

3 ×10^-1 mol L^-1

Question 4

Consider the reaction equilibrium 2SO₂(g)+O₂(g)⇌2 SO₃ (g); ΔHº = -198 kJ

On the basis of Le Chatelier's principle, the condition favourable for the forward reaction is -

[AIEEE-2003]

Accepted Answer

Lowering the temperature and increasing the pressure

Answer

Any value of temperature and pressure

Answer

Lowering of temperature as well as pressure

Answer

Increasing temperature as well as pressure

Question 5

What is the equilibrium expression for the reaction P₄(s) + 5O₂(g) ⇌ P₄O₁₀(s) ?

Accepted Answer

K_C = 1/ [O₂]⁵

Answer

K_C = [P₄O₁₀] / [P₄] [O₂]⁵

Answer

K_C = [P₄O₁₀] / 5 [P₄] [O₂]

Answer

K_C = [O₂]⁵

Question 6

For the reaction CO_(g) + Cl_2(g)⇌COCl_2(g) the K_P/K_C is equal to -

[AIEEE-2004]

Accepted Answer

1/RT <gdiv></gdiv>

Answer

RT <gdiv></gdiv>

Answer

1.0 <gdiv></gdiv>

Answer

none <gdiv></gdiv>

Question 7

The equilibrium constant for the reaction N_2(g) + O_2(g)⇌2NO_(g) at temperature T is 4×10^-4. The value of K_C for the reaction NO_(g)⇌1/2 N_2(g) + O_2(g) at the same temperature is-

[AIEEE-2004]

Accepted Answer

50

Answer

2.5 × 10²

Answer

4 &times; 10-4

Answer

0.02

Question 8

For the reaction 2 NO_2(g) ⇌ 2 NO_(g) + O_2(g),

(K_c = 1.8 × 10^_6 at 184ºC)

(R = 0.0831 kJ/(mol.K))

When K_p and K_c are compared at 184ºC it is found that

[AIEEE-2005]

Accepted Answer

K_p is greater than K_c

Answer

K_p is less than K_c

Answer

Whether K_p is greater than, less than or equal to K_c depends upon the total gas pressure

Answer

Kp = Kc

Question 9

The exothermic formaton of ClF₃ is represented by the equation -

Cl_2(g)+3F_2(g)⇌ 2ClF_3(g) ; Δ_rH = -329 kJ

Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃ ?

Accepted Answer

Adding F₂

Answer

Removing Cl₂

Answer

Increasing the temperature

Answer

Increasing the volume of the container

Question 10

A schematic plot of ln K_eq versus inverse of temperature for a reaction is shown below

The reaction must be

Accepted Answer

exothermic

Answer

endothermic

Answer

highly spontaneous at ordinary temperature

Answer

one with negligible enthalpy change

Question 11

An amount of solid NH₄HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm pressure. Ammonium hydrogen sulphide decomposes to yield NH₃ and H₂S gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm ? The equilibrium constant for NH₄HS decomposition at this temperature is

[AIEEE-2005]

Accepted Answer

0.11

Answer

0.18

Answer

0.30

Answer

0.17

Question 12

Phosphorus pentachloride dissociates as follows, is a closed reaction vessel,

PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)

If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl₅ is x, the partial pressure of PCl₃ will be

[AIEEE 2006]

Accepted Answer

Answer

Answer

Answer

Question 13

The equilibrium constant for the reaction

SO₃(g) ⇌ SO₂(g) + 1/2 O₂(g) is K_c = 4.9×10^-2. The value of K_c for the reaction

2SO₂(g)+O₂(g) ⇌ 2SO₃(g) will be

[AIEEE 2006]

Accepted Answer

416

Answer

2.40 × 10^-3

Answer

9.8 × 10^-2

Answer

4.9 × 10^-2

Question 14

For the following three reactions a, b and c, equilibrium constants are given

(a) CO(g) + H₂O(g) ⇌ CO₂(g) +H₂ (g); K₁

(b) CH₄(g) + H₂O(g) ⇌ CO(g) + 3H₂(g); K₂

(c) CH₄(g) + 2H₂O(g) ⇌ CO₂(g) + 4H₂(g); K₃

Which of the following relations is correct

Accepted Answer

K₃ = K₁K₂

Answer

K₂ K₃ = K₁

Answer

K₃ K₂³ = K₁²

Answer

Question 15

The equilibrium constants Kp₁ and Kp₂ for the reactions X ⇌ 2Y and Z ⇌ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressures at these equilibria is -

[AIEEE 2008]

Accepted Answer

1 :36

Answer

1 : 1

Answer

1 : 3

Answer

1 : 9

Question 16

A vessel at 1000 K contains CO₂ with a pressure of 0.5 atm. Some of the CO₂ is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of Kp i_s:

[AIEEE 2011]

Accepted Answer

1.8 atm

Answer

3 atm

Answer

0.3 atm

Answer

0.18 atm

Question 17

The equilibrium constant (K_c) for the reaction N₂(g)+O₂(g) → 2NO(g) at temperature T is

4×10^-4. The value of K_c for the reaction,
NO(g)→ ½ N₂(g) + ½O₂(g) at the same temperature is:

[AIEEE 2012]

Accepted Answer

50.0

Answer

4x10-4

Answer

0.02

Answer

2.5x102

Previous Year Questions: Chemical Equilibrium with solutions - Free MCQ

MCQ Practice Test & Solutions: Test: Previous Year Questions: Chemical Equilibrium (17 Questions)

For the reaction
[AIEEE-2002]

Which of the following equilibria is not affected by change in volume of the flask
[AIEEE-2002]

For the reaction equilibrium N₂O₄ (g) ⇌ 2NO₂ (g) the concentrations of N₂O₄ and NO₂ at equilibrium are 4.8 × 10^-2 and 1.2 × 10^-2 mol L^-1 respectively. The value of K_C for the reaction is -
[AIEEE-2003]

Consider the reaction equilibrium 2SO₂(g)+O₂(g)⇌2 SO₃ (g); ΔHº = -198 kJ
On the basis of Le Chatelier's principle, the condition favourable for the forward reaction is -
[AIEEE-2003]

What is the equilibrium expression for the reaction P₄(s) + 5O₂(g) ⇌ P₄O₁₀(s) ?

For the reaction CO_(g) + Cl_2(g)⇌COCl_2(g) the K_P/K_C is equal to -
[AIEEE-2004]

The equilibrium constant for the reaction N_2(g) + O_2(g)⇌2NO_(g) at temperature T is 4×10^-4. The value of K_C for the reaction NO_(g)⇌1/2 N_2(g) + O_2(g) at the same temperature is-
[AIEEE-2004]

For the reaction 2 NO_2(g) ⇌ 2 NO_(g) + O_2(g),
(K_c = 1.8 × 10^_6 at 184ºC)
(R = 0.0831 kJ/(mol.K))
When K_p and K_c are compared at 184ºC it is found that
[AIEEE-2005]

The exothermic formaton of ClF₃ is represented by the equation -
Cl_2(g)+3F_2(g)⇌ 2ClF_3(g) ; Δ_rH = -329 kJ
Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃ ?

A schematic plot of ln K_eq versus inverse of temperature for a reaction is shown below
The reaction must be

Phosphorus pentachloride dissociates as follows, is a closed reaction vessel,
PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)
If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl₅ is x, the partial pressure of PCl₃ will be
[AIEEE 2006]

The equilibrium constant for the reaction
SO₃(g) ⇌ SO₂(g) + 1/2 O₂(g) is K_c = 4.9×10^-2. The value of K_c for the reaction
2SO₂(g)+O₂(g) ⇌ 2SO₃(g) will be
[AIEEE 2006]

For the following three reactions a, b and c, equilibrium constants are given
(a) CO(g) + H₂O(g) ⇌ CO₂(g) +H₂ (g); K₁
(b) CH₄(g) + H₂O(g) ⇌ CO(g) + 3H₂(g); K₂
(c) CH₄(g) + 2H₂O(g) ⇌ CO₂(g) + 4H₂(g); K₃
Which of the following relations is correct

The equilibrium constants Kp₁ and Kp₂ for the reactions X ⇌ 2Y and Z ⇌ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressures at these equilibria is -
[AIEEE 2008]

A vessel at 1000 K contains CO₂ with a pressure of 0.5 atm. Some of the CO₂ is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of Kp i_s:
[AIEEE 2011]

The equilibrium constant (K_c) for the reaction N₂(g)+O₂(g) → 2NO(g) at temperature T is
4×10^-4. The value of K_c for the reaction,
NO(g)→ ½ N₂(g) + ½O₂(g) at the same temperature is:
[AIEEE 2012]

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Previous Year Questions: Chemical Equilibrium with solutions - Free MCQ

MCQ Practice Test & Solutions: Test: Previous Year Questions: Chemical Equilibrium (17 Questions)

For the reaction [AIEEE-2002]

Which of the following equilibria is not affected by change in volume of the flask[AIEEE-2002]

For the reaction equilibrium N2O4 (g) ⇌ 2NO2 (g) the concentrations of N2O4 and NO2 at equilibrium are 4.8 × 10-2 and 1.2 × 10-2 mol L-1 respectively. The value of KC for the reaction is - [AIEEE-2003]

Consider the reaction equilibrium 2SO2(g)+O2(g)⇌2 SO3 (g); ΔHº = -198 kJOn the basis of Le Chatelier's principle, the condition favourable for the forward reaction is -[AIEEE-2003]

What is the equilibrium expression for the reaction P4(s) + 5O2(g) ⇌ P4O10(s) ?

For the reaction CO(g) + Cl2(g) ⇌ COCl2(g) the KP/KC is equal to - [AIEEE-2004]

The equilibrium constant for the reaction N2(g) + O2(g) ⇌ 2NO(g) at temperature T is 4×10-4. The value of KC for the reaction NO(g) ⇌ 1/2 N2(g) + O2(g) at the same temperature is- [AIEEE-2004]

For the reaction 2 NO2(g) ⇌ 2 NO(g) + O2(g),(Kc = 1.8 × 10_6 at 184ºC)(R = 0.0831 kJ/(mol.K))When Kp and Kc are compared at 184ºC it is found that [AIEEE-2005]

The exothermic formaton of ClF3 is represented by the equation -Cl2(g)+3F2(g)⇌ 2ClF3(g) ; ΔrH = -329 kJWhich of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3 ?

A schematic plot of ln Keq versus inverse of temperature for a reaction is shown belowThe reaction must be

Phosphorus pentachloride dissociates as follows, is a closed reaction vessel,PCl5(g) ⇌ PCl3(g) + Cl2(g)If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x, the partial pressure of PCl3 will be [AIEEE 2006]

The equilibrium constant for the reactionSO3(g) ⇌ SO2(g) + 1/2 O2(g) is Kc = 4.9×10-2. The value of Kc for the reaction2SO2(g)+O2(g) ⇌ 2SO3(g) will be [AIEEE 2006]

For the following three reactions a, b and c, equilibrium constants are given (a) CO(g) + H2O(g) ⇌ CO2(g) +H2 (g); K1(b) CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g); K2(c) CH4(g) + 2H2O(g) ⇌ CO2(g) + 4H2(g); K3Which of the following relations is correct

The equilibrium constants Kp1 and Kp2 for the reactions X ⇌ 2Y and Z ⇌ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressures at these equilibria is - [AIEEE 2008]

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of the CO2 is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of Kp is: [AIEEE 2011]

The equilibrium constant (Kc) for the reaction N2(g)+O2(g) → 2NO(g) at temperature T is4×10-4. The value of Kc for the reaction, NO(g)→ ½ N2(g) + ½O2(g) at the same temperature is: [AIEEE 2012]

Topic-wise MCQ Tests for NEET

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About this NEET Practice Test

Explore more NEET Study Resources

For the reaction
[AIEEE-2002]

Which of the following equilibria is not affected by change in volume of the flask
[AIEEE-2002]

For the reaction equilibrium N₂O₄ (g) ⇌ 2NO₂ (g) the concentrations of N₂O₄ and NO₂ at equilibrium are 4.8 × 10^-2 and 1.2 × 10^-2 mol L^-1 respectively. The value of K_C for the reaction is -
[AIEEE-2003]

Consider the reaction equilibrium 2SO₂(g)+O₂(g)⇌2 SO₃ (g); ΔHº = -198 kJ
On the basis of Le Chatelier's principle, the condition favourable for the forward reaction is -
[AIEEE-2003]

What is the equilibrium expression for the reaction P₄(s) + 5O₂(g) ⇌ P₄O₁₀(s) ?

For the reaction CO_(g) + Cl_2(g)⇌COCl_2(g) the K_P/K_C is equal to -
[AIEEE-2004]

The equilibrium constant for the reaction N_2(g) + O_2(g)⇌2NO_(g) at temperature T is 4×10^-4. The value of K_C for the reaction NO_(g)⇌1/2 N_2(g) + O_2(g) at the same temperature is-
[AIEEE-2004]

For the reaction 2 NO_2(g) ⇌ 2 NO_(g) + O_2(g),
(K_c = 1.8 × 10^_6 at 184ºC)
(R = 0.0831 kJ/(mol.K))
When K_p and K_c are compared at 184ºC it is found that
[AIEEE-2005]

The exothermic formaton of ClF₃ is represented by the equation -
Cl_2(g)+3F_2(g)⇌ 2ClF_3(g) ; Δ_rH = -329 kJ
Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃ ?

A schematic plot of ln K_eq versus inverse of temperature for a reaction is shown below
The reaction must be

Phosphorus pentachloride dissociates as follows, is a closed reaction vessel,
PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)
If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl₅ is x, the partial pressure of PCl₃ will be
[AIEEE 2006]

The equilibrium constant for the reaction
SO₃(g) ⇌ SO₂(g) + 1/2 O₂(g) is K_c = 4.9×10^-2. The value of K_c for the reaction
2SO₂(g)+O₂(g) ⇌ 2SO₃(g) will be
[AIEEE 2006]

For the following three reactions a, b and c, equilibrium constants are given
(a) CO(g) + H₂O(g) ⇌ CO₂(g) +H₂ (g); K₁
(b) CH₄(g) + H₂O(g) ⇌ CO(g) + 3H₂(g); K₂
(c) CH₄(g) + 2H₂O(g) ⇌ CO₂(g) + 4H₂(g); K₃
Which of the following relations is correct

The equilibrium constants Kp₁ and Kp₂ for the reactions X ⇌ 2Y and Z ⇌ P + Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressures at these equilibria is -
[AIEEE 2008]

A vessel at 1000 K contains CO₂ with a pressure of 0.5 atm. Some of the CO₂ is converted into CO on the addition of graphite. If the total pressure at equilibrium is 0.8 atm, the value of Kp i_s:
[AIEEE 2011]

The equilibrium constant (K_c) for the reaction N₂(g)+O₂(g) → 2NO(g) at temperature T is
4×10^-4. The value of K_c for the reaction,
NO(g)→ ½ N₂(g) + ½O₂(g) at the same temperature is:
[AIEEE 2012]