Answer :

The changes observe when dilute HCl was added to limestone are:

i. Effervescence of carbon dioxide gas is formed.


ii. Bubbles are also produced.


Explanation: When dilute HCl was added to limestone (CaCO3), effervescence of carbon dioxide is formed due to the following reaction:


CaCO3 + 2HCl CaCl2 + H2O + CO2


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