Problem: Classify the following half-reactions as reduction or oxidation.a. Cr2O72- (aq) + 14 H+ (aq) + 6 e- → 2 Cr3+ (aq) + 7 H2O (l)b. Fe3+ (aq) + 3 e- → Fe (s)c. Au (s) + 2 CN- (aq) → Au(CN)2- (aq) + e-d. HgO (s) + H2O (l) + 2 e- → Hg (l) + 2 OH- (aq)e. 2 Cl- (aq) → Cl2 (g) + 2 e-

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We're being asked to classify the given half-reactions as reduction or oxidation.

Recall:

 Oxidation half-reactionlost electrons (electrons are on the product side)

 Reduction half-reactiongained electrons (electrons are on the reactant side)

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Problem Details

Classify the following half-reactions as reduction or oxidation.

a. Cr2O72- (aq) + 14 H+ (aq) + 6 e- → 2 Cr3+ (aq) + 7 H2O (l)

b. Fe3+ (aq) + 3 e- → Fe (s)

c. Au (s) + 2 CN- (aq) → Au(CN)2- (aq) + e-

d. HgO (s) + H2O (l) + 2 e- → Hg (l) + 2 OH- (aq)

e. 2 Cl- (aq) → Cl2 (g) + 2 e-

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