The most appropriate gastric emptying in someone who ingested a non-corrosive substance that has no recommended antidote is activated charcoal.
This is the type of charcoal formed when it  is heated in the presence of a gas thereby creating pores or spaces in its structure.
Since the substance is non corrosive and has no antidote then it is best to use activated charcoal as it helps to filter the contaminants or toxic substance thereby making it the most appropriate choice.
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The remaining part of the question is:
The nurse should recommend performing gastric lavage with which substance?