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When a water insoluble substance "X" is added to dil. HCL a colourless,odouless gas is evolved.when the gas is passed through lime water it turns milky.

Write the chemical formula of X and the chemical quation involved.


The substance is calcium carbonate CaCO3
CaCO3+2HCI gives rise to CaCl2+H2O+CO2
CO2 is the gas evolved which has the ability to turn lime water milky
2 4 2
Water insoluble substance is CaCO₃
CaCO₃(s)+ H₂SO₄(aq) = CaSO₄(aq)+H₂O(aq)+CO₂(g)
ca(oh)2+co2= caco3(milky)+h2o

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