Question

5.) Write balanced equations for the reactions between a metal (M) and hydrochloric acid (HCl) when the metal commonly adopts a.) the +3 oxidation state and b.) the +2 oxidation state.

Answer 1

Normally, when metals react with HCl, they from a chloride salt and hydrogen gas.
a) 2M + 6HCl → 2MCl₃ + 3H₂

b) M + 2HCl → MCl₂ + H₂