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Isotope(s) of hydrogen which

Question:

Isotope(s) of hydrogen which emits low energy $\beta^{-}$ particles with $t_{1 / 2}$ value $>12$ years is/are

  1. Protium

  2. Tritium

  3. Deuterium

  4. Deuterium and Tritium


Correct Option: , 2

Solution:

${ }_{1}^{1} \mathrm{H}$ and ${ }_{1}^{2} \mathrm{H}$ are stable while ${ }_{1}^{3} \mathrm{H}$ is radioactive.

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