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

Answer:

Explanation:

Metal compound A = CaCO3            

Gas evolved will be = CO2

When calcium carbonate reacts with hydrochloric acid, the gas so produced is carbon dioxide gas with an effervescence. As we all know, that the gas carbon dioxide is also used as a fire extinguisher. Hence, it extinguishes the burning candle. Therefore, the metal compound A is calcium carbonate.  The balanced chemical equation for the reaction if one of the compounds formed is calcium chloride will be -

CaCO3 + 2HCl --- CaCl2 + CO2 + H2O

Answer 2

Answer: Compound A = Calcium carbonate

Explanation:

When calcium carbonate reacts with hydrochloric acid, the calcium and chloride combines to form calcium carbonate which releases carbon dioxide as by-product.

When a container is filled with carbon dioxide, we cannot light the candle in the container.  

Because of carbon dioxide formation, the product is produced as effervescence.

The chemical reaction is given below:

$\begin{array}{c}{2 \mathrm{CaCO}_{3}} \\ {\text {Calcium carbonate}}\end{array} + \begin{array}{c}{4 H C l} \\ {\text {Hydrochloric acid}}\end{array} \rightarrow \begin{array}{c}{2 C a C l_{2}} \\ {\text { Calcium chloride }}\end{array} + \begin{array}{c}{2 C O_{2}} \\ {\text { Carbon dioxide }}\end{array} + \begin{array}{l}{2 H_{2} O} \\ {\text { Water }}\end{array}$