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

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Answer 1

If it is mass A
$Y \to 2 Z$
Reactant $R = 60 \times 8.5 = 10 m e V$
Product $P = 2 \times 30 \times 5 = 300 m e V$
$Δ E = - 210 m e V$
Therefore Endothermic
If it was C
$W \to 2 Y$
$R = 120 \times 75 = 900 m e V$
$P = 2 \times 60 \times 8.5 = 1020 m e V$
$Δ E = 120 m e V$
Therefore Exothermic
If it was D
$X \to Y + Z$
$R = 90 \times 8 = 720 m e V P = 60 \times 8.5 + 30 \times 5 = 66.0 m e V$
$Δ E = - 60 m e V$
Therefore Endothermic

Answer 2

If it is mass A

Y \to 2 Z

Reactant

R = 60 \times 8.5 = 10 m e V

Product

P = 2 \times 30 \times 5 = 300 m e V

Δ E = - 210 m e V

Therefore Endothermic

If it was C

W \to 2 Y

R = 120 \times 75 = 900 m e V

P = 2 \times 60 \times 8.5 = 1020 m e V

Δ E = 120 m e V

Therefore Exothermic

If it was D

X \to Y + Z

R = 90 \times 8 = 720 m e V P = 60 \times 8.5 + 30 \times 5 = 66.0 m e V

Δ E = - 60 m e V

Therefore Endothermic