Chemical Equilibrium Test

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Chemical Equilibrium Test - 29

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Weekly Quiz Competition

Question 1
4 / -1

N₂ + O₂ ⇌ 2NO + Heat
In the above gaseous reversible reaction, if pressure is increased, then the equilibrium constant would be

A
unchanged

B
increased

C
decreased

D
sometimes increased, sometimes decreased
Question 2
4 / -1

Consider the following equilibrium in a closed container,
N₂O₄ (g) ⇌ 2 NO₂ (g)
At a fixed temperature, the volume of the reaction container is halved. For this change, which of the following statement holds true regrading the equilibrium constant (K_P) and degree of dissociation (α) ?

A
Neither K_P nor α changes

B
Both K_P nor α changes

C
K_P changes but α does not

D
K_P does not change but α changes

Solution
Question 3
4 / -1

The equilibrium constant of a reaction is 300. If the volume of reaction flask is tripled, then the equilibrium constant is

A
300

B
600

C
900

D
100
Question 4
4 / -1

In the reaction H₂ + I₂ ⇌ 2HI
In a 2 L flask, 0.4 mole of each H₂ and I₂ are taken. At equilibrium, 0.5 moles of HI are formed. What will be the value of equilibrium constant K_C?

A
20.2

B
25.4

C
0.284

D
11.11
Question 5
4 / -1

Two moles of PCl₅ were heated in a closed vessel of 2 L. At equilibrium, 40% of PCl₅ is dissociated into PCl₃ and Cl₂. The value of equilibrium constant is

A
0.53

B
0.267

C
2.63

D
5.3
Question 6
4 / -1

56 g of nitrogen and 8 g of hydrogen gas are heated in a closed vessel. At equilibrium, 34 g of ammonia are present. The equilibrium number of moles of nitrogen, hydrogen and ammonia respectively are

A
1, 2, 2

B
2, 2, 1

C
1, 1, 2

D
2, 1, 2
Question 7
4 / -1

Which of the following is not a characteristic property of chemical equilibrium ?

A
Rate of forward reaction is equal to rate of backward reaction at equilibrium

B
After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time

C
For A (g) ⇌ B (g), K_C is 10^-2. If this reaction is carried out in the presence of catalyst, the value of K_C decreases

D
After reaching the equilibrium, both forward and backward reactions continue to take place
Question 8
4 / -1

A monoprotic weak acid (HA) is ionised 5% in 0.1 M aqueous solution. What is the equilibrium constant for its ionisation ?
HA (a) + H₂O (l) ⇌ H₃O⁺ (aq) + A^- (aq)

A
2.63 × 10⁴

B
2.63 × 10³

C
2.63 × 10^-4

D
2.63 × 10^-3
Question 9
4 / -1

The equilibrium reaction that is not influenced by volume change at constant temperature is

A
H₂ (g) + I₂ (g) ⇌ 2HI (g)

B
N₂ (g) + 3H₂ (g) ⇌ 2 NH₃ (g)

C
N₂O₄ (g) ⇌ 2NO₂ (g)

D
2NO (g) + O₂ (g) ⇌ 2NO₂ (g)
Question 10
4 / -1

At a given temperature, the equilibrium constant for the reaction of
PCl₅ ⇌ PCl₃ + Cl₂ is 2.4 × 10^-3. At the same temperature, the equilibrium constant for the reaction
PCl₃ (g) + Cl₂ ⇌ PCl₅ (g) is

A
2.4 × 10^-3

B
-2.4 × 10^-3

C
4.2 × 10²

D
4.8 × 10^-2

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Chemical Equilibrium Test - 29

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Chemical Equilibrium Test - 29

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Question 1

unchanged

increased

decreased

sometimes increased, sometimes decreased

Question 2

Neither KP nor α changes

Both KP nor α changes

KP changes but α does not

KP does not change but α changes

Solution

Question 3

300

600

900

100

Question 4

20.2

25.4

0.284

11.11

Question 5

0.53

0.267

2.63

5.3

Question 6

1, 2, 2

2, 2, 1

1, 1, 2

2, 1, 2

Question 7

Rate of forward reaction is equal to rate of backward reaction at equilibrium

After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time

For A (g) ⇌ B (g), KC is 10-2. If this reaction is carried out in the presence of catalyst, the value of KC decreases

After reaching the equilibrium, both forward and backward reactions continue to take place

Question 8

2.63 × 104

2.63 × 103

2.63 × 10-4

2.63 × 10-3

Question 9

H2 (g) + I2 (g) ⇌ 2HI (g)

N2 (g) + 3H2 (g) ⇌ 2 NH3 (g)

N2O4 (g) ⇌ 2NO2 (g)

2NO (g) + O2 (g) ⇌ 2NO2 (g)

Question 10

2.4 × 10-3

-2.4 × 10-3

4.2 × 102

4.8 × 10-2

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Neither K_P nor α changes

Both K_P nor α changes

K_P changes but α does not

K_P does not change but α changes

For A (g) ⇌ B (g), K_C is 10^-2. If this reaction is carried out in the presence of catalyst, the value of K_C decreases

2.63 × 10⁴

2.63 × 10³

2.63 × 10^-4

2.63 × 10^-3

H₂ (g) + I₂ (g) ⇌ 2HI (g)

N₂ (g) + 3H₂ (g) ⇌ 2 NH₃ (g)

N₂O₄ (g) ⇌ 2NO₂ (g)

2NO (g) + O₂ (g) ⇌ 2NO₂ (g)

2.4 × 10^-3

-2.4 × 10^-3

4.2 × 10²

4.8 × 10^-2