Exams › JEE Advanced › Chemistry
Consider the following properties and determine how many of them have a HIGHER value for protium (¹H) compared to deuterium (²H): Relative natural abundance, Atomic mass, Melting point, Boiling point, Density, Bond dissociation energy, Enthalpy of fusion, Enthalpy of vaporization.
- 2
- 3
- 4
- 5
Correct answer: 2
Solution
Among the listed properties, protium exceeds deuterium only in relative natural abundance. Atomic mass of protium (1) < deuterium (2), so atomic mass is higher for deuterium. All other physical properties (mp, bp, density, bond energy, enthalpies) are higher for the heavier isotope deuterium due to lower zero-point vibrational energy.
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