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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen1 Mark
MCQ
When electric current is passed through an ionic hydride in the molten state:
  • ✓
    Hydrogen is liberated at the anode.
  • B
    Hydrogen is liberated at the cathode.
  • C
    No reaction takes place.
  • D
    Hydride ion migrates towards cathode.
✓

Answer

Correct option: A.
Hydrogen is liberated at the anode.
Lonic hydrides in their molten state can conduct electricity and on electrolysis liberate dihydrogen gas at anode, which confirms the existence of $H^-$ ion.
$2\text{H}^-(\text{melt})\xrightarrow{\text{Anode}}\text{H}_2(\text{g})+2\text{e}^-$

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