CaCO3(S)+SO2 (g)→∆CaSO3 (s)+CO2 (g)
CaO+SO2→CaSO3
2CaSO3 (s) +O2 (g) + 4H2O(1)→2 [CaSO4.2H2O] [gypsum]
CaO+Co2→CaCO3
CaO+2NO2+12O2→Ca(NO3)2
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