The correct statement of the following is:

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(A) Option $(b)$ is incorrect because the nuclear mass is lower than the mass of its constituents due to the mass defect.Option $(c)$ is incorrect bec

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The $Q$-value of a nuclear process is the difference between final and initial kinetic energies.

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(A) Option $(b)$ is incorrect because the nuclear mass is lower than the mass of its constituents due to the mass defect.Option $(c)$ is incorrect because nuclides with the same number of protons are known as isotopes.Option $(d)$ is incorrect because,in nuclear fusion,two or more lighter nuclei combine to form a heavier nucleus.Option $(a)$ is correct because,in a nuclear reaction,the $Q$-value is defined as $Q = K.E_{	ext{final}} - K.E_{	ext{initial}}$.

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