Provide K expression for the reverse of the following reaction:
Fe₂O₃(s) + 3 H₂(g) ⇌ 2 Fe(s) + 3 H₂O(g)

• A.
• B.
• C.
• D.

Answer: (D)

Verified step by step guidance

1. Identify the given reaction: Fe2O3(s) + 3 H2(g) ⇌ 2 Fe(s) + 3 H2O(g).
2. Recognize that the equilibrium constant expression (K) for a reaction is based on the concentrations of the gaseous and aqueous species, excluding solids and liquids.
3. For the forward reaction, the equilibrium expression K is given by: K = ([H2O]^3) / ([H2]^3).
4. To find the K expression for the reverse reaction, take the reciprocal of the forward reaction's K expression.
5. Thus, the K expression for the reverse reaction is: K_reverse = ([H2]^3) / ([H2O]^3).