MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

In the reaction NO (g) + O _3 (g) NO _2 (g) + O _2 (g) , nitrogen is oxidized from +2 to +4. O _3 acts as an oxidizing agent. In the reaction 2 KI (aq) + H _2 O (l) + O _3 (g) 2 KOH (aq) + I _2 (g) + O _2 (g) , iodine is oxidized from -1 to 0. O _3 acts as an oxidizing agent. In the reaction PbS (s) + 4 O _3 (g) PbSO _4 (s) + 4 O _2 (g) , sulphur is oxidized from -2 to +6. O _3 acts as an oxidizing agent. In the reaction H _2 O _2 (l) + O _3 (g) H _2 O (l) + 2 O _2 (g) , both hydrogen peroxide and ozone undergo mutual reduction. Ozone reduces H _2 O _2 to H _2 O and itself gets reduced to O _2. Thus, this reaction exhibits the reducing property of ozone. Answer: H _2 O _2 (l) + O _3 (g) H _2 O (l) + 2 O _2 (g)