Question

Assertion :The fission of a heavy nucleus is always accompanied with the neutrons along with two product nuclei. Reason: For a lighter stable nuclide, the $\frac{N}{Z}$ ratio has to be slightly greater than $1.$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Since the positive protons in the nucleus repel each other, neutrons are required to bind the nucleus together. For lighter elements, the number of protons and neutrons are approximately equal. As the number of protons increases the force required to hold the nucleus together increases and to such an extent that more neutrons are required and the ratio of neutrons/protons is greater than one. For heavier elements, the number of neutrons in the nucleus is approximately one and a half times the number of protons.