When an electric current is passed through a molten ionic hydride (such as or ), which of the follow — Hydrogen Chemistry Question
Question
When an electric current is passed through a molten ionic hydride (such as $NaH$ or $CaH_2$), which of the following electrochemical observations definitively confirms the presence of the hydride ion ($H^-$)?
Answer: B
💡 Solution & Explanation
In molten ionic hydrides, hydrogen exists as the hydride ion ($H^-$). During electrolysis, anions migrate to the anode, where they undergo oxidation. Therefore, $2H^- \rightarrow H_2(g) + 2e^-$, leading to the liberation of dihydrogen gas at the anode.
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