Which of the following is not absorbed by activated charcoal?

Activated charcoal is effective at adsorbing many substances that can cause poisoning or overdose, but not all substances are well bound to it. Hydrocarbons, such as gasoline or other petroleum products, fall into a category that is poorly adsorbed by activated charcoal. These substances typically do not bind effectively to the charcoal due to their chemical structure and hydrophobic properties, which allow them to dissolve in lipids and resist absorption by the charcoal's surface.

In contrast, acetaminophen and many antidepressants can be effectively adsorbed by activated charcoal if administered shortly after ingestion, as these substances are less hydrophobic and can interact more favorably with the activated charcoal. Acids, while not a class of substances generally treated with activated charcoal due to their corrosive nature, can also be poorly adsorbed. However, it’s the hydrocarbons that stand out as not being absorbed by activated charcoal, making the distinction clear.