The redox reaction among the following is

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Canvas Classes · Accepted Answer

Redox reaction = reaction involving change in oxidation states.

Step 1 — Analyse each option:

(1) Formation of ozone from O₂:

O is  in  and  in  (average). No change in oxidation state → Not redox ✗

(2)  with :

This is a double displacement/precipitation reaction. No change in oxidation states → Not redox ✗

(3)  with NaOH:

Acid-base neutralisation. No change in oxidation states → Not redox ✗

(4)  at 2000 K:
- N:  (oxidised)
- O:  (reduced)
Change in oxidation states → Redox reaction ✓

A

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