Which of the following can produce fair amount of H 2 gas at anode on the electrolysis of the fused mass

Question

Which of the following can produce fair amount of H 2 ​ gas at anode on the electrolysis of the fused mass

TestHub · Accepted Answer

On electrolysis of fused compounds, H₂ gas is produced at the anode only when the compound contains hydride ions (H⁻).

In CaH₂, hydride ions are oxidized at the anode:

$2 H^{-} \to H_{2} + 2 e^{-}$

NaCl and KHF₂ do not contain free hydride ions, so they do not produce H₂ at the anode.

BeH₂ is covalent/polymeric and does not yield a significant amount of H₂ on fused electrolysis.

Correct Answer: (D) CaH₂

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