Carbon dioxide is produced in the reaction between calcium carbonate and hydrochloric acid.
Sulfur dioxide may be catalytically oxidized to sulfur trioxide. Lightning discharges in the atmosphere catalyze the conversion of nitrogen to nitric oxide. Suppose that 150.0 Ib of ferric oxide are available. Zinc metal will react with either hydrochloric or sulfuric acid to produce hydrogen gas. Phosphoric acid is produced in the reaction between calcium phosphate and sulfuric acid.