If the equilibrium constants for the systems H2 + I2 ⇄

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If the equilibrium constants for the systems H₂ + I₂ ⇄ 2HI and 2HI ⇄ H₂ + I₂ are K₁ and K₂ respectively, the relationship between K₁ and K₂ is :

1. K₁ = K₂
2. K₁ = 2K₂
3. K₁ = K₂/2
4. K 1 = 1 /K₂

Correct Option: D

As per the Law of Mass Action, if Kf is the equilibrium constant for the equation A + B C + D, then 1/Kf is the equilibrium constant for the reverse equation, C + D A + B. So, as per the question K1 is the equilibrium constant for H₂ + I2 2HI, then 1/K₁ is equilibrium constant for the reverse equation 2 HI H₂ + I₂