Exams › JEE Advanced › Chemistry
Which of the following reactions is used to prepare HD gas (hydrogen deuteride)?
- 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 (containing H⁻) reacts with D2O, the hydride ion reacts with the deuterium of water to release HD gas: NaH + D2O → NaOD + HD. This elegantly combines one H (from hydride) and one D (from water) to give the mixed isotope HD. Electrolysis of D2O gives D2, not HD.
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