When an electric current is passed through a molten ionic hydride (such as or ), which of the following electrochemical observations definitively confirms the presence of the hydride ion ()?

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 ($H^-$)?

Prashant Kotian · Accepted Answer

Correct answer: B. In molten ionic hydrides, hydrogen exists as the hydride ion (). During electrolysis, anions migrate to the anode, where they undergo oxidation. Therefore, , leading to the liberation of dihydrogen gas at the anode.

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