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MCQs Test of Chemical Equilibrium | Interactive Quiz 🧪💡Test Your Knowledge Now! ⚖️🔥
1. In the equilibrium system PCl5(g) ⇌ PCl3(g) + Cl2(g), the correct relationship between Kc and Kp is:
a
Kp > Kc
Right
b
Kp < Kc
Wrong
c
Kp = Kc
Wrong
d
Kp/Kc = 1
Wrong
Answer: (a)
Δn = (1+0) − 1 = +1 ⇒ Kp = Kc(RT)^Δn, so Kp > Kc.
Δn = (1+0) − 1 = +1 ⇒ Kp = Kc(RT)^Δn, so Kp > Kc.
2. In the reaction A(g) + B(g) ⇌ 2C(g), the equilibrium constants Kp = Kc because:
a
Δn > 1
Wrong
b
Δn < 1
Wrong
c
Δn = 1
Wrong
d
Δn = 0
Right
Answer: (d)
Δn = 2 − 2 = 0, so Kp = Kc.
Δn = 2 − 2 = 0, so Kp = Kc.
3. What happens to the value of Kc when a catalyst is added to a chemical system at equilibrium?
a
It decreases
Wrong
b
it increases
Wrong
c
It becomes zero
Wrong
d
it remains unchanged
Right
Answer: (d)
Catalyst has no effect either on the value of Kc and equilibrium position. A catalyst just establishes equilibrium earlier by increasing the rates of both forward and reverse reactions.
Catalyst has no effect either on the value of Kc and equilibrium position. A catalyst just establishes equilibrium earlier by increasing the rates of both forward and reverse reactions.
4. The correct Kₛₚ expression of a sparingly soluble salt Li₂C₂O₄ among the following is
a
Kₛₚ = [Li⁺][C₂O₄²⁻]
Wrong
b
Kₛₚ = [2Li⁺][ C₂O₄²⁻]
Wrong
c
Kₛₚ =[2Li⁺]²[C₂O₄²⁻]²
Wrong
d
Kₛₚ = [Li⁺]² [C₂O₄²⁻]
Right
Answer: (d)
For A₂B type salt; Ksp = [S] ² [S]
In this sparingly soluble salt Li₂C₂O₄, Li is present as monovalent cation (Li⁺) while C₂O₄²⁻ called oxalate ion is bivalent carrying 2- charge. Thus Kₛₚ expression for Li₂C₂O₄ is Kₛₚ=[Li⁺]² [C₂O₄²⁻]
For A₂B type salt; Ksp = [S] ² [S]
5. The term active mass use in law of mass action means:
a
No. of mole
Wrong
b
No. of molecules
Wrong
c
gram per dm³
Wrong
d
mole per dm³
Right
Answer: (d)
The term active mass use in law of mass action means molar concentration or molarity or mol per dm³ mol per liter.
The term active mass use in law of mass action means molar concentration or molarity or mol per dm³ mol per liter.
6. If the equilibrium expression of a reversible reaction is
Kc = [C]²/[A][B]a
A+B ⇌ 2C
Right
b
A+B ⇌ C
Wrong
c
2C ⇌ A+ B
Wrong
d
C ⇌ A+B
Wrong
Answer: (a)
The species in numerator indicate product while in denominator shows reactant. The power of each concentration shows the numerical stoichiometric coefficient of the respective species. Here C in numerator is reactant whose coefficient is 2 while A and B in denominator are product having coefficient equal to 1 which is not written in the equation. The multiplication sign between species is replaced by plus sign in between them in the equation. In between reactant and product, double half-headed arrow is place to show the nature of reaction as reversible (2C ⇌ A + B)
The species in numerator indicate product while in denominator shows reactant. The power of each concentration shows the numerical stoichiometric coefficient of the respective species. Here C in numerator is reactant whose coefficient is 2 while A and B in denominator are product having coefficient equal to 1 which is not written in the equation. The multiplication sign between species is replaced by plus sign in between them in the equation. In between reactant and product, double half-headed arrow is place to show the nature of reaction as reversible (2C ⇌ A + B)
7. The equilibrium of N₂ (g) + O2(g) ⇌ 2NO(g) (ΔH = +ve) is affected by change in:
a
Both temperature & pressure
Wrong
b
Neither temperature nor pressure
Wrong
c
Pressure only
Wrong
d
Temperature only
Right
Answer: (d)
Since reaction is exothermic & gaseous occurring by no change in volume, so only temperature change can affect equilibrium.
Since reaction is exothermic & gaseous occurring by no change in volume, so only temperature change can affect equilibrium.
8. The equilibrium of which of the following reaction would NOT be affected by an increase in pressure:
a
PCl₅ (g) ⇌ PCl₃(g) + Cl₂(g)
Wrong
b
2NO(g) + Cl₂(g) ⇌ 2NOCl(g)
Wrong
c
N₂(g) + O₂(g) ⇌ 2NO(g)
Right
d
2SO₂(g) + O₂(g) ⇌ 2SO₃(g)
Wrong
Answer: (c)
The change in pressure can only affect gaseous homogeneous equilibria in which there is a volume change. All the above reactions are gaseous but reaction c involves no change in volume. Hence reaction c is independent of pressure change.
The change in pressure can only affect gaseous homogeneous equilibria in which there is a volume change. All the above reactions are gaseous but reaction c involves no change in volume. Hence reaction c is independent of pressure change.
9. NaCl when added to an aqueous silver chloride solution:
a
Decreases the solubility of AgCI
Right
b
Increases the solubility of AgCl
Wrong
c
Forms a clear solution
Wrong
d
Does not effect
Wrong
Answer: (a)
AgCl is a sparingly soluble salt or weak electrolyte while NaCl is completely soluble salt or strong electrolyte containing Cl⁻ ion as a common ion. The addition of common ion to the weak electrolyte suppresses its ionization and solubility thereby increasing its precipitation.
AgCl is a sparingly soluble salt or weak electrolyte while NaCl is completely soluble salt or strong electrolyte containing Cl⁻ ion as a common ion. The addition of common ion to the weak electrolyte suppresses its ionization and solubility thereby increasing its precipitation.
10. Some reactions are nearly to completion in the forward direction and identified by their:
a
Very low value of Kc
Wrong
b
Very high value of ΔH
Wrong
c
Very low value of ΔH
Wrong
d
Very high value of Kc
Right
Answer: (d)
Very high value of Kc is suggestive of high tendency for forward reaction and such reversible reactions may be considered as irreversible.
Very high value of Kc is suggestive of high tendency for forward reaction and such reversible reactions may be considered as irreversible.
11. Sodium chloride is purified by passing hydrogen chloride gas in an impure solution of sodium chloride. It is based on
a
Buffer action
Wrong
b
Association of salt
Wrong
c
Hydrolysis of salt
Wrong
d
Common ion effect
Right
Answer: (d)
The purification of sodium chloride is based on common ion effect. Here HCl provides common chloride ion which decreases the solubility of NaCl thereby increasing its precipitation.
The purification of sodium chloride is based on common ion effect. Here HCl provides common chloride ion which decreases the solubility of NaCl thereby increasing its precipitation.
12. Rate of endothermic reaction will………………with increase in temperature
a
Decrease
Wrong
b
Same
Wrong
c
No effet
Wrong
d
Increase
Right
Answer: (d)
As Kc increases with the rise of temperature for endothermic reaction, increase in temperature will increase the rate of endothermic reactions. Reverse effect is seen for exothermic reactions.
As Kc increases with the rise of temperature for endothermic reaction, increase in temperature will increase the rate of endothermic reactions. Reverse effect is seen for exothermic reactions.
13. For a reaction 3A + 2B ⇌ C, the Kc expression is written as:
a
[A]³ [B]²/[C]³
Wrong
b
[A]² [B]³/[C]
Wrong
c
[A]³ [B]³/ [C]²
Wrong
d
[C] / [A]³ [B]²
Right
Answer: (d)
For writing Kc expression, active masses of product appear in numerator while active masses of reactants appear in denominator. The numerical stoichiometric coefficients become power of the respective concentration terms. Correct option is ‘d’.
For writing Kc expression, active masses of product appear in numerator while active masses of reactants appear in denominator. The numerical stoichiometric coefficients become power of the respective concentration terms. Correct option is ‘d’.
14. Kₚ > Kc, when
a
Δn = 0
Wrong
b
Δn = −Value
Wrong
c
Δn = + Value
Right
d
None of them
Wrong
Answer: (c)
Kₚ > Kc, when Δn = + Value (reaction occurs with increase in number of moles of gaseous products) We know: Kₚ = Kc(RT)▵ⁿ where Δn = (moles of gaseous products)−(moles of gaseous reactants) Case analysis: If Δn = 0 → Kₚ=Kc If Δn < 0 → Kₚ 0 → Kₚ>Kc
Kₚ > Kc, when Δn = + Value (reaction occurs with increase in number of moles of gaseous products) We know: Kₚ = Kc(RT)▵ⁿ where Δn = (moles of gaseous products)−(moles of gaseous reactants) Case analysis: If Δn = 0 → Kₚ=Kc If Δn < 0 → Kₚ
15. In which of the following case does the reaction not go farthest to completion
a
Kc = 10²
Wrong
b
Kc = 10
Wrong
c
Kc = 1
Wrong
d
Kc = 10⁻²
Right
Answer: (d)
K Small value of Kc is indicative of completion of backward reaction. In option ‘d’, Kc is smallest.
K Small value of Kc is indicative of completion of backward reaction. In option ‘d’, Kc is smallest.
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