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a) Carbon di oxide gas is formed. CO2
b)When we pass this gas into lime water, it turns milky.
c)CaCO3 --heat-- CaO + CO2
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a ) after heating calcium carbonate (marble) carbon dioxide is formed
b) we can observe that the limewater turns milky
but if more carbon dioxide is added to the milky solution,the solution turns clear because of the formation of calcium hydrogen carbonate
c) caco3+o2(process of heating or combustion involves in mixing of o2)
=CaO+CO2
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