$\begin{array}{1 1} \text{(a) All metal carbonates react with acid to give a salt, water and carbon dioxide } \\\text{
(b) All metal oxides react with water to give salt and acid} \\ \text{(c) Some metals react with acids to give salt and hydrogen} \\ \text{(d) Some non metal oxides react with water to form an acid}
\end{array} $
