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Q 1272734636.    

Assertion : Radioactive heavy nuclei decay by a series of `α` -and/or `β` -emissions, to form a stable isotope of lead.

Reason : Radioactivity is a physical phenomenon.

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

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