Q.

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

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a

increases with mass number at high mass numbers

b

decreases with mass number at high mass numbers

c

increases with mass number at low mass numbers

d

decreases with mass number at low mass numbers

answer is D.

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Detailed Solution

The  binding  energy per nucleon for the nuclides (from A =20 to A = 56) is maximum. Hence, these are more stable. As the mass number increases, the binding energy per nucleon gradually decreases and Ultimately binding energy per nucleon Of heavy nuclides (such as uranium, etc.) is comparatively low. Hence,these nuclides  are relatively fissioned easily.
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