Question

when the gas form on heating limestone is passed through freshly prepared limewater, limewater turns milky.

Answer 1

CO2 is released when we heat lime stone
and when this gas is passed to limewater orCaO then it turns milk as there is formation of CaCo3

Answer 2

This experiment can be find experimentally. Take a one beaker of lime water or calcium hydroxide in a test tube. Now form carbon dioxide by heating the limestone and pass this certain amount of carbon dioxide through freshly prepared lime water.

By doing this we find that a milky precipitate formed. This is the precipitate of calcium carbonate. So, due to the precipitate of ‘calcium carbonate’ lime water turns “milky”.