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Heavy Water

Name the gas ...

Question

Name the gas that is produced in the following cases.
At the anode during the electrolysis of acidified water.

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Solution

During electrolysis of acidified water, oxidation at anode:
$O H^{-} \to O H + e^{-} O H + O H \to H_{2} O + O O + O \to O_{2} ↑$
Oxygen gas evolves.

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