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Identify the incorrect statement about ortho and para hydrogen.

1. Normal hydrogen is an equilibrium blend of ortho-hydrogen and para-hydrogen.
2. In ortho-hydrogen, the spins of the two nuclei are aligned in the same direction.
3. Ortho and para hydrogen differ in their chemical properties.
4. In para-hydrogen, the spins of the two nuclei are oriented in opposite directions.

Correct answer: Ortho and para hydrogen differ in their chemical properties.

Solution

Ortho- and para-hydrogen have identical chemical properties and differ only in physical properties (boiling point, thermal conductivity), so 'they differ in chemical properties' (option 2) is the incorrect statement. The stored statement (normal H2 is an ortho/para blend) is true.

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