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Question

A few drops of ethanoic acid were added to solid sodium carbonate. The observation made was that :
(1) a hissing sound was produced
(2) brown fumes evolved
(3) brisk effervescence occurred
(4) a pungent smelling gas was evolved

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Solution

When ethanoic acid reacted with solid sodium carbonate, it will give sodium carboxylate, water and carbon dioxide is eliminated. Elimination of carbon dioxide gives brisk effervescence.
2CH3COOH(aq)+Na2CO3(s)2CH3COONa(aq)+CO2(g)+H2O(l)

Hence, the correct answer is option 3.

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Ethanol and Ethanoic Acid
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