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Equilibrium Constant and Standard Free Energy Change

Which of the ...

Question

Which of the following equilibrium remains unaffected by a change in pressure (or volume)?

A

2 N O C l (g) ⇌ 2 N O (s) + C l_{2} (g)

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B

H_{2} (g) + C O_{2} (g) ⇌ H_{2} O (g) + C O (g)

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C

3 P b S (s) + 3 O_{2} (g) ⇌ 2 P b O (s) + 2 S O_{2} (g)

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D

P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)

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Solution

The correct option is B $H_{2} (g) + C O_{2} (g) ⇌ H_{2} O (g) + C O (g)$
Equilibrium remain unaffected by change in pressure when $Δ n = 0$ for the reaction.
(a) $2 N O C l (g) ⇌ 2 N O (s) + {C l}_{2} (g) Δ n = 1 - 2 = - 1$
(b) $H_{2} (g) + {C O}_{2} (g) ⇌ H_{2} O (g) + C O (g) Δ n = 1 + 1 - 1 - 1 = 0$
(c) $3 P b S (s) + {3 O}_{2} (g) ⇌ 2 P b O (s) + {2 S O}_{2} (g) Δ n = 2 - 3 = - 1$
(d) ${P C l}_{5} (g) ⇌ {P C l}_{3} (g) + {C l}_{2} (g) Δ n = 1 + 1 - 1 = 1$

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