JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Which pair does not show hydrogen isotopes? [UP SEE 2003]

(A) and hydrogenCorrect
(B)Protium and deuterium
(C)Deuterium and tritium
(D)Tritium and protium

Answer: (A)

Solution

Protium, deuterium and tritium are the three true isotopes of hydrogen (same number of protons, different numbers of neutrons), so pairs (B), (C) and (D) are all isotope pairs. Ortho- and para-hydrogen,

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Question ID VK-137179