By cooling ordinary hydrogen gas to a very low temperature it has been possible to get pure:

para hydrogen

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ortho hydrogen

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deutarium

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atomic hydrogen

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Solution

The correct option is A para hydrogen
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.

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By cooling ordinary hydrogen gas to a very low temperature it has been possible to get pure:

The correct option is A para hydrogen 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.

The correct option is A para hydrogen
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.