Calcium combines with carbon to produce the ionic compound calcium carbide. In calcium carbide, the oxidation number of carbon is $-1$. When calcium carbide reacts with water, it is hydrolysed readily and forms only two products. What might the formulae be for calcium carbide and for the two products formed by hydrolysis?
- ACa$_2$C; CaO and $\text{C}_2\text{H}_4$
- BCa$_2$C; Ca(OH)$_2$ and $\text{C}_2\text{H}_2$
- CCaC$_2$; CaO and $\text{C}_2\text{H}_4$
- DCaC$_2$; Ca(OH)$_2$ and $\text{C}_2\text{H}_2$