Chemical EquilibriumHard

Question

For the reaction N2(g) + O2(g) ⇋ 2NO (g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction 2NO (g) + O2(g) ⇋ 2NO2(g), What is K for the reaction NO2(g) ⇋ N2(g) + O2(g) ?

Options

A.1/( 4 K1 K2 )
B.[1/( K1 K2)]1/2 
C.1/( K1 K2 )
D.1/( 2 K1 K2 )

Solution

N2(g )+ O2(g) ⇋ 2NO (g); K1       ....(i)
2NO (g) + O2(g) ⇋ 2NO2(g); K2      ....(i)

N2(g) + O2(g) ⇋ 2NO2(g); K = K1 × K2
∴ For NO2(g) ⇋ N2(g) + O2(g); K =

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