Classify oxides as acidic, including SO(_2) and CO(_2), or basic, including CuO and CaO, related to metallic and non-metallic character

Describe the reactions, if any, of: (a) potassium, sodium and calcium with cold water (b) magnesium with steam (c) magnesium, zinc, iron, copper, silver and gold with dilute hydrochloric acid and explain these reactions in terms of the position of the metals in the reactivity series