Out of the following redox reactions I. NH ₄ NO ₃ ~N ₂ O +2 H ₂ O II. NH ₄ NO ₂ ~N ₂+2 H ₂ O III. PCl ₅ PCl ₃+ Cl ₂ disproportionation is not shown in

Step-by-step solution

I. NH _ -3 ⁺ NO ₃⁻ +1 ~N ₂ O +2 H ₂ O It is a redox reaction but not a disproportionation reaction. Since, different N -species are involved. II. NH _ -3 ⁺ _ +3 ⁺ NO ₂ ⁻ 0 ~N ₂ same as (I) III. PCl ₅ PCl ₃ + +3-1 Cl ₂ Thus, it is also not a disproportionation reaction.