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Question

The most abundant isotope of hydrogen is

A
Tritium
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B
Deuterium
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C
Protium
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D
Para hydrogen
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Solution

The correct option is C Protium
Protium is the most abundant hydrogen isotope, with an abundance of 99.984%. It consists of one proton and one electron with no neutron. It is typically not found in its monoatomic form, but bonded with itself (H2) or other elements.
The abundance of deuterium and tritium are 0.016 % and 1015 % respectively.
Para hydrogen is not a isotope of hydrogen.
Hence, the correct answer is option (c)

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