Which reaction is a good small-scale laboratory method for the preparation of hydrogen? A) CH₄(g) + H₂O(g) → CO(g) + 3H₂(g) B) 3FeCl₂(s) + 4H₂O(g) → Fe₃O₄(s) + 6HCl(g) + H₂(g) C) NaH(s) + H₂O(l) → NaOH(aq) + H₂(g) D) CO(g) + H₂O(g) → CO₂(g) + H₂(g) E) None of these methods is useful.

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Choice C shows a reaction between sodium hydride and water, which is a common small-scale laboratory method for the preparation of hydrogen gas. Sodium hydride reacts with water to produce hydrogen gas and sodium hydroxide. The other choices show reactions that do not directly produce hydrogen gas or are not practical for small-scale laboratory preparation of hydrogen.

Which Reaction Is a Good Small-Scale Laboratory Method for the Preparation