Q2 of 29 Page 73

Write down the changes that will be seen in each instance and explain the reason behind it.

Dilute HCl was added to limestone.

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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