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Which of the following derivatives of nitrogen affords an aqueous solution having a pH of...

Chemistry
JAMB 1980

Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?

  • A. N2O
  • B. NO
  • C. NO2
  • D. NaNO3
  • E. NH3
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Correct Answer: Option C
Explanation

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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