COMEDK2025ChemistryRedox ReactionsActual
The oxidation number of potassium in K ₂ O , K ₂ O ₂ and KO ₂ respectively are:
Options
- A+1,+2,+1
- B+1,+2,+4
- C+2,+1,+1
- D+1,+1,+1
Correct answer
D. +1,+1,+1
Step-by-step solution
In K ₂ O , the oxidation number of oxygen is -2 . Let the oxidation number of potassium be x . Then 2x + (-2) = 0 , which gives x = +1 . In K ₂ O ₂ , the oxygen is in the peroxide form, O ₂²⁻ , where the oxidation number of oxygen is -1 . Let the oxidation number of potassium be x . Then 2x + 2(-1) = 0 , which gives 2x = 2 , so x = +1 . In KO ₂ , the oxygen is in the superoxide form, O ₂⁻ , where the oxidation number of oxygen is -0.5 . Let the oxidation number of potassium be x . Then x + 2(-0.5) = 0 , which gives