Which is true about the different forms of hydrogen?

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ortho-hydrogen has same spins of two nuclei clockwise or anticlockwise

para-hydrogen has different spins of two nuclei

At absolute zero, there is 100%o para form and at high temperature, there is 75% ortho form.

All of the above

answer is D.

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Detailed Solution

There are two isomeric forms of molecular hydrogen:

(1) Ortho hydrogen: Both nuclei's spins are oriented in the same direction, clockwise or anticlockwise.
(2) para hydrogen: Both nuclei's spins are in the opposite direction, therefore if one nuclei's spin is clockwise, the other nuclei's spin is anti-clockwise, and vice versa.

At 20 K, a para isomeric form of hydrogen prevails with 99.8% whereas, at room temperature, only 25% of the para isomer exits with the remaining 75% ortho hydrogen.

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