Which reaction involves neither oxidation nor reduction? (a) CrO_4^2-⟶Cr_2O_7^2- (b) Cr⟶CrCl_3 (c...

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Counter-Strike: Source
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Which reaction involves neither oxidation nor reduction?
(a) CrO_4^2-⟶Cr_2O_7^2-
(b) Cr⟶CrCl_3
(c) Na⟶Na^+
(d) 2  S_2O_3^2-⟶S_4O_6^2-

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