The reagent used in testing for carbon (IV) oxide is
Answer Details
The reagent used in testing for carbon (IV) oxide is lime water.
Lime water is a clear solution made by dissolving calcium hydroxide in water. When carbon (IV) oxide is bubbled through lime water, it turns milky white due to the formation of calcium carbonate. This reaction is a simple and easy way to detect the presence of carbon (IV) oxide in the air or in a gas sample.