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MHT CET202616 April 2026Morning ShiftChemistryRedox ReactionsActual

What is the oxidation number of oxygen in KO ₂ ?

Options

  1. A-2
  2. B-1/2
  3. C-1
  4. D+2

Correct answer

B. -1/2

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

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