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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.
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QuestionScienceClass 10

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.

When a metal compound reacts with an acid it gives metallic salt, carbon dioxide and water. The carbon dioxide $$(CO_2)$$ so evolved extinguishes the burning candle as $$CO_2$$ is a non supporter of combustion. The metallic compound $$A$$ in the reaction is $$CaCO_{3}$$ which reacts with $$HCl$$ to form a metallic salt $$(CaCl_{2})$$, $$CO_{2}$$ and $$H_{2}O$$. The balanced chemical equation for the reaction is:
$$CaCO_{3} + 2 HCl → CaCl_{2} +CO_{2} + H_{2}O$$