Question

Which statement is true about this reaction?

mc016-1.jpg
It is a practical source of energy on Earth.
It occurs only outside the solar system.
Its product is heavier than each of its reactants.
It shows the critical mass of an element.

Answer 1

"Its product is heavier than each of its reactants."

Reason: the reaction shown is a fusion (light nuclei combine to form a heavier nucleus). The fused product is heavier than either reactant individually (though lighter than their sum due to mass defect).