Chemical Equilibrium Test

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Chemical Equilibrium Test - 6

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Question 1
1 / -0

For reaction A₂ ⇌ A

The value of equilibrium constant (K) at 500 K is 1 x 10^-7 and at 700 K is 3.36 x 10^-7. The given reaction is a/an

A
exothermic reaction

B
endothermic reaction

C
spontaneous reaction

D
non-spontaneous reaction

Solution

For endothermic reaction value of equilibrium constant increases with increase with temperature. As the value of K increases with increase in temperature, therefore, given reaction is endothermic in nature.
Question 2
1 / -0

A vessel contains three gases H₂, I₂ and HI at equilibrium, He gas is introduced in the vessel so that the total pressure increases but the temperature and volume remain constant. According to Le-Chaltelier's Principle, the dissociation of HI will

A
decrease

B
increase

C
change but the change is unpredictable

D
remain constant

Solution

Helium gas is an inert gas. The equilibrium is not effected by the addition of an inert gas at a constant volume as the concentration of the reactants and products does not change.
Since there is no change in the number of gaseous moles in the given reaction;
H₂(g) + I₂(g) ⇌ 2HI(g)
The equilibrium is not effected even on the addition of an inert gas at a constant pressure.
Question 3
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For which of the following gaseous equilibria, at a constant temperature, doubling the volume would cause a shift of equilibrium to the right?

A
2CO + O₂ ⇌ 2CO₂

B
N₂ + 3H₂ ⇌ 2NH₃

C
N₂ + O₂ ⇌ 2NO

D
PCl₅ ⇌ PCl₃ + Cl₂

Solution

Doubling the volume would reduce the pressure and shift the equilibrium in the direction of increasing gaseous moles.
PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)
The above reaction proceeds with the increase in the number of gaseous moles.