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A heterogeneous catalyst in the form of a solid state adhered to the reaction chamber would be most effective in which of the following systems?
The activation of hydrogen ions in an acidic solution using silver salts.
Removal of hard metals from water in a water purification system.
The removal of carbon dioxide from a fish tank using a filter system.
The separation of nitrogen gas from oxygen gas through cryogenic distillation used to fill scuba air tanks.