What is change in oxidation number of nitrogen when $\mathrm{NO}_3^{-}$is converted to $\mathrm{NH}_4^{+}$ion?

What is change in oxidation number of nitrogen when $\mathrm{NO}_3^{-}$is converted to $\mathrm{NH}_4^{+}$ion?
  1. +5 to -3
  2. -3 to +5
  3. +3 to -5
  4. -5 to +3

Asked in: MHT CET 2024 (15 May Shift 2)

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