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Q.

A radio active nucleus emits both α and β+ particles. Initial mass number of the nucleus is 260. After emission of α and β+ particles, the final mass number of the nucleus is 236 and the nucleus becomes an isotone. Then number of emitted β+ particles is

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a

8

b

12

c

7

d

5

answer is B.

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Detailed Solution

Let number of emitted α and β particles be x and y respectively. ∴ A−4x−Z−2x−y=A−Z⇒y=2x..........1and A−4x=A1⇒x=A−A14⇒x=260−2364=6∴ y=2×6=12

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