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Fission of nuclei is possible because the binding energy per nucleon in them

1. increases with mass number at low mass numbers
2. decreases with mass number at low mass numbers
3. increases with mass number at high mass numbers
4. decreases with mass number at high mass numbers

Correct answer: decreases with mass number at high mass numbers

Solution

Fission occurs in heavy nuclei because the binding energy per nucleon decreases with increasing mass number at high mass numbers, making the nucleus less stable and prone to splitting.

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