Select the true statement below regarding the following balanced reaction: MnO4-(aq) + NO(g) --> MnO2(s) + NO3-(aq)

Question

Select the true statement below regarding the following balanced reaction:

MnO₄^-(aq) + NO(g) --> MnO₂(s) + NO₃^-(aq)

1) since a solid is formed, this is a redox reaction and a precipitation reaction

2) NO oxidizes MnO₄^- to MnO₂

3) NO is the reducing agent in the forward reaction

4) four electrons are transferred during the reaction as written

5) none of the above are true

The correct answer is 3, and I understand why 3 is correct. However, I was just wondering why 4 is considered wrong?

Answer 1

Well, let's take a look and see how many electrons are being transferred.

MnO₄^- + 4H⁺ + 3e- ==> MnO₂ + 2H₂O ... reduction reaction

NO + 2H₂O ===> NO₃^- + 4H⁺ + 3e- ... oxidation reaction

Looks like 3 electrons are transferred. Mn goes from 7+ to 4+ and N goes from 2+ to 5+

The question is, why is #1 incorrect?