Ortho- and para-hydrogens have

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(A) Ortho-hydrogen and para-hydrogen are nuclear spin isomers of the hydrogen molecule $(H_2)$.In ortho-hydrogen,the nuclear spins of the two protons

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Identical chemical properties but different physical properties

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(A) Ortho-hydrogen and para-hydrogen are nuclear spin isomers of the hydrogen molecule $(H_2)$.In ortho-hydrogen,the nuclear spins of the two protons are parallel,whereas in para-hydrogen,the nuclear spins are antiparallel.Because they have the same electronic structure,their chemical properties are identical.However,due to the difference in their nuclear spin states,they exhibit different physical properties,such as different thermal conductivities and specific heats.

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