Question

the gas formed on heating limestone is passed through freshly prepared lime water the limewater turns milky give reason

Answer 1

Hello Dear.

Here is the answer----

The Gas formed on heating limestone is Carbon dioxide. When this gas is passed through lime water, it forms Calcium Carbonate or limestone which turns milky.

Reaction for the above is---
When Limestone is heated,
    CaCO₃ --------Heat------- CaO + CO₂.
(limestone)

When Carbon Dioxide is passed through lime water,

   CO₂ + Ca(OH)₂ ------------- CaCO₃↓ + H₂O.
           (lime water)

Reason ⇒
When Carbon dioxide is passed through Lime water or Calcium Hydroxide, it turns milky due to the formation of the Precipitate of the insoluble milky Calcium Carbonate.


Hope it helps.

Answer 2

Explanation:

when limestone is heated calcium oxide and carbon dioxide are formed this carbon dioxide gas is passed through freshly prepared lime water insoluble calcium carbonate and water are formed in this reaction lime water turns milky

Ca (CH)2+co2➡CaCO3+H2O