Assertion :Nuclear binding energy per nucleon is in the order $_{4}^{9} B e >_{3}^{7} L i >_{2}^{4} H e$ . Reason: Binding energy per nucleon increases linearly with difference in number of neutrons and protons.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Binding energy depends on the mass defect (mass lost when the constituent protons and neutrons combine to form nucleus). Binding energy is direct measurement of stability of nucleus. Higher the binding energy(means high loss of energy during formation of nucleus from protons and neutrons) per nucleon, higher is stability of the nucleus. The order of binding energy is $_{2}^{4} H e >_{3}^{7} L i >_{4}^{9} B e$ .

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Assertion :Nuclear binding energy per nucleon is in the order 94Be>73Li>42He. Reason: Binding energy per nucleon increases linearly with difference in number of neutrons and protons.

Assertion :Nuclear binding energy per nucleon is in the order $_{4}^{9} B e >_{3}^{7} L i >_{2}^{4} H e$ . Reason: Binding energy per nucleon increases linearly with difference in number of neutrons and protons.