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# $NO_2$ combines with atmospheric moisture to form mixture of $2NO_2+H_2O\rightarrow x+y$.The x is

$\begin{array}{1 1}(a)\;HNO_2\\(b)\;HNO_3\\(c)\;HNO\\(d)\;HNO_4\end{array}$

$2NO_2 +H_2O \to HNO_2 +HNO_3$