The hypothetical electrochemical cell, represented by X (s) + X2 ? (1.00 mol L-1

Question

The hypothetical electrochemical cell, represented by
X (s) + X2 ? (1.00 mol L-1) ?? Cu2 + (0.01 mol L-1) ? Cu (s)
It has the potential equal to 0.686 volts.
This hypothetical cell was built by two half-cells,
formed by an unknown electrode immersed in a solution
concentration of 1.00 mol l-1 containing its X2 + and other cations
formed by a copper electrode immersed in a solution
diluted with Cu 2+ ions in concentration 0.01 mol L-1.
Under the conditions of the statement, the electrodes have the
Standard potential:Justify your answer explaining.

Under these conditions, X is
(A) tin.
(E) cadmium.
(C) iron.
(D) zinc.
(E) chromium.

Explanation / Answer

(D) Zn

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