C-12-Q162mediumsingle_mcqChemical formula of lime stone is—aCaO\mathrm{CaO}CaObCa(OH)2\mathrm{Ca(OH)_2}Ca(OH)2cCaCO3\mathrm{CaCO_3}CaCO3dCaCl2\mathrm{CaCl_2}CaCl2