6. What is the ionic equation for a metal carbonate and (HCl) acid reaction?

• CO3^2- (s) + 2H+ -> CO2 (g) + H2O (l)
• OH- (aq) + H+ (aq) -> H2O (l)
• M2CO3 (s) + 2 HCl (aq) -> 2MCl (aq) + CO2 (g) + H2O (l)
• M (s) + 2H+ (aq) -> Mg2+ (aq) + H2 (g)