Question

when the gas formed on heating limestone is passed through freshly prepared lime water the lime water turns milky .​

Answer 1

Answer:

When limestone is heated, calcium oxide and carbon dioxide gas are formed. When carbon dioxide gas is passed through freshly prepared lime water, the solution turns milky due to the formation of calcium carbonate, which is insoluble in water.

Explanation:

Answer 2

• when limestone is heated

CaCO3 + ∆ ⇒ CaO + CO2⇑

• lime water turns milky

Ca(OH)2 + CO2 ⇒ CaCO3 + H2O

it turns into milky due to formation of calcium carbonate (CaCO3).