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3g of activated charcoal was added to 50 mL of acetic acid solution $(0.06\;N)$ in a flask. After an hour it was filtered was found to be $0.042\;N$ . The amount of acetic acid absorbed (per gram of charcoal ) is :

$\begin{array}{1 1} 42\;mg \\ 54\;mg\\ 18\;mg \\ 36\;mg \end{array} $

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18 mg
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