N3H is the molecular formula of the smallest neutral compound of nitrogen and hydrogen, therefore option (b) is correct.
What do you mean by the molecular formula?
The molecular formula is the expression of the number of atoms of each element in one molecule of a compound.
Molecular formulas do not specify any information regarding the arrangement of atoms. Hence, one molecule formula can describe a number of different chemical structures.
It gives the type and number of atoms of every element present within the molecular compound.
N3H is the molecular formula of the smallest neutral compound of nitrogen and hydrogen, hence option (b) is correct.
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