Question

The equilibrium constant of the following reactions are :

(I) CH₄ (g) + H₂O (g) $\rightleftarrows$CO (g) + 3H₂ (g) K₁

(II) CO (g) + H₂O (g)$\rightleftarrows$CO₂ (g) + H₂ (g) K₂

(III) CO₂ (g) +4H₂ (g) $\rightleftarrows$

CH₄ (g) + 2H₂O (g) K₃

Which of the following is true ?

• A. log K₃ = log K₁ + log K₂
• B. log K₁+ log K₂ + log K₃ = 0
• C. log K₃ = log K₁ — log K₂
• D. log K₃ = $\frac { 1 } { 2 }$(log K₁ + log K₂)

Answer 1

Answer: (B)

log K₁+ log K₂ + log K₃ = 0

Answer 2

CH₄ (g) + 2H₂O (g) $\rightleftarrows$ CO₂ (g) +4H₂ (g) K

= K₁K₂

\ $\frac { 1 } { \mathrm {~K} _ { 3 } }$ = K₁ K₂

or K₃ K₂ K₁ = 1

or log K₁ + log K₂ + logK₃ = 0