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An elements A undergoes successive radio...

An elements A undergoes successive radioactive decay following sequences beta^(-),beta^(-),X,beta^(-),Y ` to form product B.

A

If X and Y both are `alpha "particles"`, then A and B are isotopes

B

If X and Y are positrons then A and B are isobars

C

If X and Y both are `beta-"particles"` then A and B are isobars

D

If X is `alpha-"particle"` and Y is `beta-"particle"` then A and B are isodiaphers

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The correct Answer is:
D
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