All the reaction between following pairs will produce hydrogen gas, except — Hydrogen Chemistry Question

💡 Solution & Explanation

I'd be happy to help, but I notice the question is incomplete—the answer choices (the pairs of reactants) aren't provided in your message. Please share: - **Option A** (and B, C, D if multiple choice) - The pairs of substances being tested for hydrogen gas production Once you provide the options, I'll explain: 1. Why option A does **NOT** produce $H_2$ gas 2. Why the other options **DO** produce $H_2$ gas **General principle:** Hydrogen gas is typically produced when: - Active metals react with dilute acids: $M + \text{acid} \rightarrow \text{salt} + H_2 \uparrow$ - Very reactive metals react with water: $M + H_2O \rightarrow \text{hydroxide} + H_2 \uparrow$ - Metals react with alkali (only Al, Zn, etc.): $M + \text{alkali} \rightarrow \text{complex} + H_2 \uparrow$ Please share the options!