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Question

Binding energy per nucleon versus mass number curve for nuclei is shown in fig.W, X, Y, and Z are four nuclei indicated on the curve. The process that would release energy is


1022919_3f507c795fb043019d2243fd97d029fc.png

A
Y2Z
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B
WX+Z
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C
XY+Z
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D
W2Y
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Solution

The correct option is C XY+Z
If it is mass A
Y2Z
Reactant R=60×8.5=10meV
Product P=2×30×5=300meV
ΔE=210meV
Therefore Endothermic
If it was C
W2Y
R=120×75=900meV
P=2×60×8.5=1020meV
ΔE=120meV
Therefore Exothermic
If it was D
XY+Z
R=90×8=720meVP=60×8.5+30×5=66.0meV
ΔE=60meV
Therefore Endothermic

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