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Question

Chemistry Question on Electrochemistry

When a molten ionic hydride is electrolysed :

A

hydrogen is liberated at cathode

B

hydrogen is liberated at anode

C

there is no reaction

D

H−{{H}^{-}} ions produced, migrate to the cathode

Answer

hydrogen is liberated at anode

Explanation

Solution

In this process, hydrogen liberates at anode, e.g., MgH2→electrolysisMg2++2H−Mg{{H}_{2}}\xrightarrow{electrolysis}M{{g}^{2+}}+2{{H}^{-}} At anode: 2H−→H2↑+ 2e−2{{H}^{-}}\xrightarrow{{}}{{H}_{2}}\uparrow +\,2{{e}^{-}} At cathode: Mg2++2e−→MgM{{g}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Mg