What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place. (b)What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.

 Calcium reacts with chlorine to form ionic chloride called calcium chloride. The reaction is vigorous. Ca(s) + Cl2(g) → CaCl2(s)

(b) Magnesium reacts with very dilute nitric acid to form magnesium nitrate and hydrogen gas Mg(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2(g)