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The mixed hydrogen-deuterium gas HD is prepared by which of the following reactions?
- Reaction of D2O with NaH
- Reaction of H2O with NaD
- Electrolysis of D2O
- Na2O2 with D2O
Correct answer: Reaction of D2O with NaH
Solution
When NaH (hydride, H⁻) reacts with D2O (deuterium oxide), the hydride ion abstracts a deuteron from D2O giving HD gas and NaOD. The reverse (NaD + H2O) would also give HD; both work, but the first option is the standard textbook answer.
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