235. In a galvanic cell, if instead of the standard zinc electrode, a mercury electrode is used, what change will occur? (The standard electrode potentials of mercury, zinc, and iron are $-0.76$, $-0.85+$, and $-0.44-$ volts, respectively.) (1) $E^\circ$ of the cell decreases by $1.29$ volts. (2) The electrode of zinc is replaced by mercury. (3) The amount of $\mathrm{Zn^{2+}(aq)}$ in the solution decreases. (4) The direction of electron current in the external circuit reverses.
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\textbf{235.} In a galvanic cell, if instead of the standard zinc electrode, a mercury electrode is used, what change will occur? (The standard electrode potentials of mercury, zinc, and iron are $-0.76$, $-0.85+$, and $-0.44-$ volts, respectively.)
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(1) $E^\circ$ of the cell decreases by $1.29$ volts. \hfill (2) The electrode of zinc is replaced by mercury.
(3) The amount of $\mathrm{Zn^{2+}(aq)}$ in the solution decreases. \hfill (4) The direction of electron current in the external circuit reverses.
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