Which of the following atom has same atomic as well as the molecular mass of their existant molecule?

H

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O

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H e

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N

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Solution

The correct option is B $H e$
Helium being an inert gas, exist in mono atomic form hence its atomic mass as well as molecular mass is same i.e.2

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Which one of the following molecule exists as tetra-atomic molecule?

H_{2} O

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