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
Y→2Z
W→X+Z
X→Y+Z
W→2Y
A
Y→2Z
B
W→X+Z
C
X→Y+Z
D
W→2Y
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Solution
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The correct option is CX→Y+Z
If it is mass A
Y→2Z
Reactant R=60×8.5=10meV
Product P=2×30×5=300meV
ΔE=−210meV
Therefore Endothermic
If it was C
W→2Y
R=120×75=900meV
P=2×60×8.5=1020meV
ΔE=120meV
Therefore Exothermic
If it was D
X→Y+Z
R=90×8=720meVP=60×8.5+30×5=66.0meV
ΔE=−60meV
Therefore Endothermic
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