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Question:

KO2 (potassium superoxide) is used in oxygen cylinders in space and submarines because it:

products ozones

absorbs CO2 and increases O2 content

absorbs CO2

eliminates moisture

Solution:

Potassium superoxide is used in oxygen cylinders in space and submarines because it absorbs CO2 and increases O2 concentration according to the following reaction: 4KO2 + 2CO2 → 2K2CO3 + 3O2. Hence, option B is correct.