Chemistry, 22.05.2020 00:00, carlie4charlie

Which half-reaction correctly describes an oxidation?
Upper C a (s) plus 2 e superscript minus right arrow upper C a superscript 2 plus (a q).
Upper B r subscript 2 plus 2 e superscript minus right arrow 2 upper B r superscript minus.
Upper N a superscript plus (a q) right arrow upper N a (s) plus e superscript minus.
Upper C r (s) right arrow upper C r superscript 3 plus (a q) plus 3 e superscript minus.

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Which half-reaction correctly describes an oxidation?
Upper C a (s) plus 2 e superscript minus...