A voltaic cell is constructed from a standard Cd2+|Cd half cell (EĀ°red = -0.403V) and a standard Hg2+|Hg half cell (EĀ°red = 0.855V).
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A voltaic cell is constructed from a standard Hg2+|Hg half-cell (EĀ°red = 0.855V) and a standard Mn2+|Mn half-cell (EĀ°red = -1.180V). The anode reaction is: Hg2+ + 2e- -> Hg The cathode reaction is: Mn2+ + 2e- -> Mn The spontaneous cell reaction is: Hg2+ + Mn2+ -> Hg + Mn The cell voltage is V.
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