Binding energy per vs mass curve for nucleus is shown in the figure $W,X,Y$and $Z$ are four nuclei indicated on the curve . The process that would rease energy is

Answer: CSolution: KEY CONCEPT: Energy is released when stability increases . This will happen when binding energy per nucleon increases
Reactant
Reaction(a) $60\times 8.5MeV=510MeV$
Reaction(b) $120\times 7.5=900MeV$ MeV$Reaction\left(c\right)$120 xx 7.5 = 900 MeV$MeV$
Reaction(d) $90\times 8=720$
Product
$2\times 30\times 5=300MeV$
$\left(90\right)\times 8+30\times 5)=870MeV$
$2\times 60\times 8.5=1020MeV$
$\left(60\times 85+30\times 5\right)=600MeV$