Answer:
The gas that extinguishes a burning candle
is carbon dioxide. It is formed by the action of dilute hydrochloric acid on a
metal carbonate or metal hydrogen carbonate and produces effervescence. Since
one of the compounds formed is calcium chloride, this shows that the metal
compound is calcium carbonate it cannot be calcium hydrogen carbonate because
calcium hydrogen carbonate is found in solution.
Thus, the metal compound A is calcium
carbonate (CaCO3).
Calcium carbonate reacts with dilute
hydrochloric acid to form chloride, carbon dioxide and water.
CaCO3(s) + 2HCl(aq) CaCl2(aq) + CO2(g)
+ H2O(l)
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