Read the given passages and answer the following question.\ It is found that mass of the nucleus is

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Read the given passages and answer the following question.\ It is found that mass of the nucleus is less than the total mass of protons and neutrons, this mass difference is called mass defect. Nuclear binding energy is the energy equivalence to the mass defect. Thus, mass defect is in the form of energy and is responsible for binding the nucleons together. Binding energy per nucleon is an another quantity which is very useful in predicting the stability of a nucleus. \ The ratio of mass defect of the nucleus to its mass number is maximum for

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(d) : The ratio of mass defect of the nucleus to its mass number is maximum for $\mathrm{Fe}^{56}$.