Question 3:

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

CaCO_3(s)    +    2HCl_(aq)           →   CaCl_2(aq)   +   CO_2(g)   +   H₂O_(l)

Calcium          Hydrochloric              Calcium        Carbon         Water

carbonate        acid                        chloride        dioxide

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