Explanation
Lighter nuclei A and B can fuse to form a heavier nucleus C. In these fusion reactions, there is a mass defect giving rise to a release in energy. On the other hand, a heavy nucleus F can be split into two nuclei D and E of moderate masses. In this fission reaction also, there is a mass defect which appears in the form of release of energy. Thus energy is released in the processes (i) and (iv).
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