Correct Answer: Option A

Explanation

When sodium ethanoate (CH\(_3\)COONa) is treated with concentrated tetraoxosulphate(VI) acid (H\(_2\)SO\(_4\)), a displacement reaction occurs. The strong mineral acid (H\(_2\)SO\(_4\)) reacts with the salt of the weaker organic acid to displace and liberate the organic acid, which is ethanoic acid (also known as acetic acid, CH\(_3\)COOH). 

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