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Question

A proton is identical to :
  1. the nucleus of helium
  2. a molecule of helium
  3. an atom of hydrogen
  4. a molecule of a hydrogen

A
a molecule of helium
B
the nucleus of helium
C
an atom of hydrogen
D
a molecule of a hydrogen
Solution
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Hydrogen atoms has only one electron and one proton. As there only one proton present inside nucleus of H atom therefore a proton is identical to an atom of hydrogen.
Option D

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