A water insoluble calcium compund (A) on reacting with dil. H2SO4 released a colourless and odourless gas, (B) with brisk effervescence .when gas B is passed through lime water,it turns milky and again formed a compound A. identify A,B and write a balanced chemical equation for the same.

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Solution

Point-1
CO₂(Carbon dioxide) is the gas which turns lime water milky

Point-2
Lime water turns milky due to the formation of calcium carbonate as shown in the given equation below.

Reaction involved-
CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂

Inference-

A = Calcium carbonate (CaCO₃ )
B = Carbon dioxide (CO₂) .
Another equation for the reaction of lime water with carbon dioxide gas-

Ca(OH)₂ + CO₂ → CaCO₃ + H₂O

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