Assertion : Energy is released in nuclear fission. Reason : Total binding energy of the fission fragments is larger than the total binding energy of the parent nucleus.

Step-by-step solution

When a heavy nucleus splits into two medium-sized ones, each of the new nuclei will have more binding energy per nucleon than the original nucleus. The extra energy will be given off. e . g . if the uranium nucleus ₉₂²³⁵ U is broken into two small nuclei, the binding energy difference per nucleon is about 0.8 MeV . The total energy given off is therefore 0.8 MeV nucleon 235 nucleon =188 MeV