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JEE Main201910 Jan 2019Morning ShiftChemistryHydrogenActual

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are

Options

  1. A2 and 1
  2. B2 and 0
  3. C3 and 1
  4. D3 and 2

Correct answer

C. 3 and 1

Step-by-step solution

Hydrogen is the first element in the periodic table and has the atomic number one. Those elements which have the same atomic number but a different mass number are called isotopes. There are three isotopes of hydrogen namely, protium H 1 1 , deuterium H 1 2 or D and lastly tritium H 1 3 or T . The isotopes are different because of the different number of neutrons present in them. Isotopes of Hydrogen: Among all three isotopes only Tritium is radioactive.

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