Final answer:
The nuclear reaction between hydrogen-2 and hydrogen-3 is classified as a fusion reaction where lighter-mass nuclei combine to form a single nucleus, releasing energy.
Explanation:
Fusion reaction is the classification for the nuclear reaction between hydrogen-2 and hydrogen-3. In fusion reactions, lighter-mass nuclei combine to form a single nucleus, releasing energy. The high kinetic energies required for fusion reactions occur at extreme temperatures present in stars like the Sun.
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