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3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :

1. 18 mg
2. 36 mg
3. 42 mg
4. 54 mg

Correct answer: 18 mg

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