Ordinary hydrogen at room temperature is a mixture of:
A
75% orthohydrogen + 25% parahydrogen
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B
25% orthohydrogen + 75% parahydrogen
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C
50% orthohydrogen + 50% parahydrogen
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D
1% orthohydrogen + 99% parahydrogen
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Solution
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.