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Which of the following is radioactive?

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Which of the following is radioactive?

(a) hydrogen sulfide

(b) vimentin

(c) tritium

(d) deuterium
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Right option is (c) tritium

To elaborate: Depending on the number of neutrons present, the hydrogen has three isotopes. Deuterium and tritium are its isotopes, out of which tritium contains two neutrons and is radioactive.
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