A Voltaic Cell Is Based on the Following Two Half-Reactions

question 83

Multiple Choice

A voltaic cell is based on the following two half-reactions: Ni⁺²(aq) + 2e⁻ → Ni(s) E° = −0.25 V
Cr⁺³(aq) + 3e^- → Cr(s) E° = -0.74 V
Sketch the cell and then select the correct statement about it.

• A) Cr serves as the cathode.
• B) The direction of electron flow through the external wire is from the Ni to the Cr electrode.
• C) Anions in solution will migrate toward the Ni+2/Ni electrode.
• D) The net cell reaction is 3Ni⁺²(aq) + 2Cr(s) → 3Ni(s) + 2Cr⁺³(aq)
• E) = 0.99 V

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