MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Let the oxidation number of oxygen in KO _2 be x. Potassium is an alkali metal, so its oxidation state is always +1 in its compounds. The sum of oxidation states of all atoms in a neutral molecule is zero. +1 + 2x = 0 2x = -1 x = -1/2 The oxidation number of oxygen in KO _2 is -1/2. Answer: -1/2