A) \[_{5}^{10}B+_{2}^{4}He\xrightarrow{{}}_{7}^{13}N+_{1}^{1}H\]
B) \[_{11}^{23}Na+_{1}^{1}H\xrightarrow{{}}_{10}^{20}Ne+_{2}^{4}He\]
C) \[_{93}^{239}Np\xrightarrow{{}}_{94}^{239}Pu+\text{-+}\overset{-}{\mathop{v}}\,\]
D) \[_{7}^{11}N_{1}^{1}H\xrightarrow{{}}_{6}^{12}C+\,{{}^{-}}+v\]
Correct Answer: C
Solution :
In any nuclear reaction mass number and atomic number should remain conserved. Reaction (c) satisfies this condition. Also, for\[_{93}^{239}Np\], neutron to proton ratio is greater than\[1.52\], which makes it unstable.
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