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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.

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Solution

  • The gas that produces effervescence and extinguishes a burning candle is carbon dioxide.
  • Dilute acids give CO2 with metal carbonates.
  • Since one of the compounds formed is calcium chloride (CaCl2) thus, the metal compound (A) is a carbonate of calcium metal.
  • Calcium carbonate (CaCO3) reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide (CO2), and water (H2O). The balanced chemical equation for the reaction is given as,

CaCO3(s)+HCl(aq)CaCl2(aq)+CO2(g)+H2O(l)

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