A.CaO(s) + 3C(s) ?CaC2 + CO(g)
B.CaCO3(s) ? CaO(s) + CO2(g)
C.CaC2(s) + H2O(I) ? Ca(OH)2 + C2H2(g)
D.C(s) + CO2(g) ?2CO(g)
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