KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines

KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it

  1. absorbs CO2
  2. eliminates moisture
  3. produces ozone
  4. absorbs CO2 and increases O2 content

Answer

Because it absorbs CO2 and increases O2 concentration according to the following reaction

4KO2 + 2CO2 → 2K2CO3 + 3O2

The correct option is D.