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How the presence of H^(-) ions confirmed...

How the presence of `H^(-)` ions confirmed in ionic hydrides?

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In the molten state, ionic hydrides conduct electricity with the liberation of dihydrogen at the anode. This confirms the presence of hydride (`H^(-)`) ion in them.
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CHHAYA PUBLICATION-HYDROGEN-SHORT ANSWER TYPE
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  13. Comment on the reactions of dihydrogen with Chlorine

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  14. Comment on the reactions of dihydrogen with sodium

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  15. Comment on the reactions of dihydrogen with copper (II) oxide.

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