Which isotope(s) of hydrogen is/are radioactive and emits low energy \( \beta^{-} \)particles? (...

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Which isotope(s) of hydrogen is/are radioactive and emits low energy \( \beta^{-} \)particles?
(i) Protium
(ii) Tritium
(iii) Deuterium
(a) (i) and (ii)
(b) (iii) only
(c) (ii) only
(d) (ii) and (iii)
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