Statement I: Ortho-hydrogen and para-hydrogen are isotopes of hydrogen that differ in their number of neutrons. Statement II: The ratio of ortho to para hydrogen stabilizes at 3:1 at room temperature,

Question

Statement I: Ortho-hydrogen and para-hydrogen are isotopes of hydrogen that differ in their number of neutrons.
Statement II: The ratio of ortho to para hydrogen stabilizes at 3:1 at room temperature, but pure para-hydrogen can be isolated at very low temperatures.

Prashant Kotian · Accepted Answer

Correct answer: D. Ortho and para hydrogen are nuclear spin isomers, not isotopes; they have the same mass but differ in the alignment of their nuclear spins. Para-hydrogen (anti-parallel spin) is more stable at lower temperatures and can reach 100% purity near absolute zero.

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