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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 Y→2ZW→X+ZX→Y+ZW→2Y

A
Y2Z
B
XY+Z
C
W2Y
D
WX+Z
Solution
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#### The correct option is CX→Y+ZIf it is mass AY→2ZReactant R=60×8.5=10meVProduct P=2×30×5=300meVΔE=−210meVTherefore EndothermicIf it was CW→2YR=120×75=900meVP=2×60×8.5=1020meVΔE=120meVTherefore ExothermicIf it was DX→Y+ZR=90×8=720meVP=60×8.5+30×5=66.0meVΔE=−60meVTherefore Endothermic

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