Question

Ordinary hydrogen at room temperature is a mixture of:

• A. 75% orthohydrogen + 25% parahydrogen
• B. 25% orthohydrogen + 75% parahydrogen
• C. 50% orthohydrogen + 50% parahydrogen
• D. 1% orthohydrogen + 99% parahydrogen

Answer 1

The correct option is A 75% orthohydrogen + 25% parahydrogen

At 0 K, hydrogen contains mainly para hydrogen. At the room temperature, the ratio of ortho to para hydrogen is 3:1.