In which process does the nitrogen undergo oxidation? — p Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Oxidation involves an increase in the oxidation state of an element. Step 2: Calculate the oxidation states of nitrogen: in N2 (0) to NH3 (-3), it is reduction; in N2O4 (+4) to NO2 (+4), there is no change; in NO3^- (+5) to N2O5 (+5), there is no change; in NO2^- (+3) to NO3^- (+5), the oxidation state of nitrogen increases from +3 to +5. Step 3: Therefore, nitrogen undergoes oxidation in the process NO2^- -> NO3^-, which corresponds to option (d).