Answer :

(a) When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes lime water milky. The turning of lime water into milky is a standard test of carbon dioxide.


Carbon dioxide (CO2) + Lime water [Ca(OH)2] —> Calcium Carbonate (CaCO3) + Water (H2O)


(b) When baking soda is added to the acetic acid then carbon dioxide gas is formed which results in formation of bubbles.


Vinegar (Acetic acid) + Baking soda (Sodium hydrogencarbonate) —> Carbon dioxide + other substances

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