Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
Answer:
The reaction involves the evolution of carbon dioxide gas (which extinguishes a burning candle) when calcium carbonate reacts with hydrochloric acid.
The balanced chemical equation for the reaction is:
CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)