An element $A$ decays into element $C$ by a two step process :

$A \to B + {\;_2}H{e^4}$

$B \to C + \;2{e^ - }$

Then

  • [AIPMT 1989]
  • A

    $A$ and $C$ are isotopes

  • B

    $A$ and $C$ are isobars

  • C

    $A$ and $B$ are isotopes

  • D

    $A$ and $B$ are isobars

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