(a) Acid + Active metal → Salt + Hydrogen
(b) Acid + base → Salt + Water
(c) Acid + Carbonate or bicarbonate → Salt + Water + carbon dioxide
(d) Acid + sulphite or bisulphite → salt + water + sulphur dioxide
(e) Acid + Sulphide → Salt + hydrogen sulphide
(a) Balanced equation of Acid + Active metal → Salt + Hydrogen:
Mg +2HCl → MgCl2 + H2
(b) Balanced equation of Acid + base → Salt + Water:
HCl + NaOH → NaCl + H2O
(c) Balanced equation of Acid + Carbonate or bicarbonate → Salt + Water + carbon dioxide:
CaCO3 +2HCl → CaCl2 +H2O + CO2
(d) Balanced equation of Acid + sulphite or bisulphite → salt + water + sulphur dioxide:
CaSO3 + 2HCl → CaCl2 + H2O+ SO2
(e) Balanced equation of Acid + Sulphide → Salt + hydrogen sulphide:
ZnS + 2HCl → ZnCl2 + H2S