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When a non-metal combines with oxygen it forms an acid.
If we take the non-metal as N.

N + O_2 =NO_2

where NO_2I= is the acid.

1. The symbol N does not represent the element Nitrogen.
2.The non-metal is always written before the oxygen in the acid's formula.
 E.g.-CO_2  and not O_2C!!
I hope this helped you!
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