Least reactive isotope of hydrogen among the following is:

_{1} H^{1}

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_{1} D^{2}

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_{1} T^{3}

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all are equally reactive

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Solution

The correct option is B $_{1} T^{3}$
$_{1} T^{3}$ (tritium is the least reactive isotope of hydrogen,because of its high mass it is stable isotope.
Hence option C is correct

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