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CaCO_3 decomposes to give CaO &CO2 produced are 5.6g & 4.4g respectively by

CaCO_3 decomposes to give CaO &CO2 produced are 5.6g & 4.4g respectively by heating 12g of an impure CaCO3 sample then the % impurity of the sample will be : a) 33.33% b) 16.67% c) 83.33% d) 20%

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