Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The equilibrium constant of the reaction SO 2 (g) + ½O 2 (g) SO 3 (g) 
is 4 × 10 –3 atm –1/2 . The equilibrium constant of the reaction 2SO 3 (g) 
2SO 2 (g) + O 2 (g) would be :
Text Solution
Verified by ExpertsThe correct answer is:
D
SO 2 (g) + 
O 2 (g) 
SO 3 (g) K p = 4×10 –3
SO 3 
SO 2 (g) + 
O 2 (g) K' p = 
K' p = 
2SO 3 
2SO 2 + O 2 (g)
K'' p = (K' p ) 2 = 
= 
= 6250 = 625 × 10 2 6.25 × 10 4 atm.
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