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The nucleus ${}_{48}^{115}{Cd}$ after two successive $β^{-}$ decays will give

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a

Pa 46115

b

In 49114

c

Sn 50113

d

Sn 50115

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detailed solution

Correct option is D

Cd 115 48 →2(β 0 -1 )Sn 115 50

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A radio active nucleus emits both $α$ and $β^{-}$ particles. Initial mass number of the nucleus is 298. After emission of $α$ and $β^{-}$ particles, the nucleus becomes an isotope and mass number becomes 274. Then number of $β^{-}$ particles emitted is

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