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Q.

In a radioactive decay chain,  90232 Th nucleus decays to 82212Pb nucleus. Let Nα and Nβ be the number of α and β− particles, respectively, emitted in this decay process which of the following statements is (are) true? 

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a

Nα=5

b

Nβ=2

c

Nα=6

d

Nβ=4

answer is A, C.

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Detailed Solution

 

Considering the laws of conservation of mass number (A) and atomic number (Z) , we can write ,

232 -4×Nα= 212 ...........(i)

and 90 -2×Nα+Nβ×1=82 ............(ii)

Solving , Nα=5 and Nβ=2

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