Answer :

4NH3 (g) +5O2 (g) → 4NO (g) +6H2O (g) is a redox reaction because oxidation and reduction both are happening simultaneously. It is also a displacement reaction because H of NH3 is displaced by oxygen. A displacement reaction is also a redox reaction as it is always followed by oxidation as well as reduction.

Note: When oxygen is added to a compound in a reaction, it is called oxidation. Removal of oxygen from a substance during a reaction is called reduction. Here, NH3 is changing to NO. So, NH3 is undergoing oxidation. Addition of hydrogen atom is also reduction. Here, oxygen is getting reduced.

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A metal X forms a waLakhmir Singh & Manjit Kaur - Chemistry