Anaesthesia General da895b4e The most important constituent in soda lime for reabsorption of CO2 in a closed circuit is – A Sodium hydroxide B Barium hydroxide C Calcium hydroxide D Potassium hydroxide High-Yield Explanation Sodalime contains Ca(OH)2 (94%), NaOH (5%), KOH (< 1%), Silica, indicator and moisture.