As safety measure in public places fire extinguishers are arranged. What compounds are there in fire extinguishers? _______, ________

PLACEHOLDER ANSWER - the answer is two compounds. A soda-acid fire extinguisher contains sodium bicarbonate, $$\text{NaHCO}_3$$, and sulphuric acid, $$\text{H}_2\text{SO}_4$$. When mixed they release $$\text{CO}_2$$, $$2\text{NaHCO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O} + 2\text{CO}_2$$, which puts out the fire.