C-09-Q056mediumsingle_mcqThe reaction of CaO\mathrm{CaO}CaO with dilute HNO3\mathrm{HNO_3}HNO3 produces—aCa(NO3)2\mathrm{Ca(NO_3)_2}Ca(NO3)2 and H2O\mathrm{H_2O}H2ObCaCl2\mathrm{CaCl_2}CaCl2 and H2O\mathrm{H_2O}H2OcCaSO4\mathrm{CaSO_4}CaSO4 and H2\mathrm{H_2}H2dCa(OH)2\mathrm{Ca(OH)_2}Ca(OH)2 and O2\mathrm{O_2}O2