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1) Name the gas evolved, when marble is dropped in dilute hydrochloric acid taken in a test tube. Write a balanced chemical equation



Ans: Chemical formula of Marble is CaCO3. When this CaCO3 reacted with dilute HCl it produces Calciumchloride and Water along with liberation of Carbon dioxide gas.
CaCO3 + 2HCl → CaCl2 + H2O + CO2

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when CaCO3 (marble) react with dilute HCl,it produces CaCl2 + H2O along with liberation of Carbon dioxide gas.

we know that:

Metal   Carbonate + Acid => metal salt + CO2 + H2O

hence, CaCO3 + 2HCl     => CaCl2 + CO2 + H2O

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