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The substance not likely to contain CaCO3 is

$ (a)\;\text{calcined gypsum} \\(b)\;\text{sea shells} \\(c)\;\text{dolomite} \\ (d)\;\text{a marble statue} $

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Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula $CaSO_4. 2H_2O$
calcined gypsum is correct answer.
Hence a is the correct answer.
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