For the two gaseous reactions (i) and (ii), at 250C
(i)NO(g)+12O2(g)⟵NO2(g)
(ii)2NO2(g)⟵2NO(g)+O2(g),
The equilibrium constants are K1 and K2 respectively. these two constants are related as:
Eq−2=−(eq−1);hence K2=1K21