Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?
NO\(_2\) (Nitrogen dioxide) is an acid anhydride. When it dissolves in water, it undergoes a disproportionation reaction to produce a mixture of two acids: nitric acid (HNO\(_3\)) and nitrous acid (HNO\(_2\)).
NO\(_2\) + H\(_2\)0 → HNO\(_3\) +. HNO\(_2\)
Because these acids release hydrogen ions (H\(^+\)) in solution, the resulting aqueous solution is acidic and has a pH of less than 7.
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