C-12-Q166mediumsingle_mcqLime stone reacts with H+\mathrm{H^+}H+ in soil to give—aCa2+\mathrm{Ca^{2+}}Ca2+, CO2\mathrm{CO_2}CO2, H2O\mathrm{H_2O}HbCa(OH)2\mathrm{Ca(OH)_2}Ca(OH)2, H2\mathrm{H_2}H2cCaCl2\mathrm{CaCl_2}CaCl2, HCl\mathrm{HCl}HCldCaO\mathrm{CaO}CaO, H2\mathrm{H_2}H2