Question

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 1

When calcium carbonate reacts with hydrochloric acid, it produces carbon dioxide gas with effervescence. ... Hence, it extinguishes a burning candle.

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Answer 2

Balanced chemical equation

• From the given condition, metal compound A is identified as calcium carbonate with chemical formula $CaCO_3$.

• When $CaCO_3$ reacts with dilute hydrochloric acid, it leads to the formation of calcium chloride and water and releases carbon dioxide gas.
• The carbon dioxide gas has the ability to put of the burning candle.
• The balanced chemical equation for the reaction if one of the compounds formed is calcium chloride is as follows:
• $CaCO_3+ 2 HCl ⇒ CaCl_2 + CO_2 + H_2 O$

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