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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?

A

The activation of hydrogen ions in an acidic solution using silver salts.

B

Removal of hard metals from water in a water purification system.

C

The removal of carbon dioxide from a fish tank using a filter system.

D

The separation of nitrogen gas from oxygen gas through cryogenic distillation used to fill scuba air tanks.

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