Metal salt (A) on treatment with dil H2SO4 gives effervescence. The produced gas turns lime water milky. If excess of produced gas is passed in it, a clear solution is obtained. The metal salt is
Metal carbonate + dil H2SO4 → CO2
CO2 + lime water → CaCO3 (Milky ppt)
CaCO3 + excess CO2 → Ca(HCO3)2 Clean solution (Transparent)
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