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Q)
Hydrogen exists as 3 isotopes -H,D,T and oxygen exists as 2 isotopes $^{16}O,^{18}$. How many radioactive water molecules are possible ?
$\begin{array}{1 1} (A) 8 \\ (B) 9 \\ (C) 12 \\ (D) 15 \end{array} $
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