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Suman Kumar Best Answer
https://www.google.com/url?sa=t&source=web&rct=j&url=https://chemistry.stackexchange.com/questions/96680/why-isnt-pure-ortho-hydrogen-possible-to-obtain%23:~:text%3DYou%2520cannot%2520make%2520ortho%2520hydrogen,para%2520molecules%2520of%2520zero%2520spin.&ved=2ahUKEwihwrT78dTtAhWd6XMBHQKtDVsQFjABegQIAhAE&usg=AOvVaw01YWJrOzYxdtUqadpGggOV
it has been possible to get pure para hydrogen by cooling ordinary hydrogen gas to a very low temperature (close to 20 K) but it is never possible to get a sample of hydrogen containing more than 75% of ortho hydrogen.Aug 15, 2020
okay