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

question 18

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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