Consider an electrochemical cell constructed from the following half cells, linked by a KCl salt bridge.• a Fe electrode in 1.0 M FeCl2 solution• a Sn electrode in 1.0 M Sn(NO3)2 solutionWhen the cell is running spontaneously, which choice includes only true statements and no false ones?Question 1 options:A. The tin electrode loses mass and the tin electrode is the cathode.B. The tin electrode gains mass and the tin electrode is the cathode.C. The iron electrode gains mass and the iron electrode is the anode.D. The iron electrode loses mass and the iron electrode is the cathode.

The loss of electron or gain of electrons or the loss of mass or gain of mass, during an electrochemical reaction depends upon the electrode potential of the materials taken.

Lower the standard electrode potential more the tendency to undergo oxidation and loss of electrons.

Let us check the standard electrode potential of the two metals taken: Fe and Sn

Fe : -0.41 V

Sn : -0.14 V

Thus Fe will undergo oxidation and will act as anode.

During oxidation a metal loses electrons and gets converted to its aqueous ions thus there is loss of mass and electrons both.

The tin electrode will act as cathode and will gain mass during the process.

The equation will be:

[tex]Fe(s)--->Fe^{+2}(aq)+2e[/tex]

The choices would be

B. The tin electrode gains mass and the tin electrode is the cathode

nizhalspark nizhalspark · Answer 2 · 2021-08-09T08:36:46+02:00

Answer:

The correct answer is option (B) The tin electrode gains mass and the tin electrode is the cathode.

Explanation:

Iron(ii) ion, [tex]Fe^+[/tex] is higher than tin(ii) ion, [tex]Sn^2^+[/tex] in the electrochemical series, therefore, tin (ii) iron is preferentially discharged to iron(ii) ion in aqueous solutions.
Also, when oxidation occurs at the anode and reduction occurs at the cathode,
in the Galvanic cell constructed from the following half cells which is linked by a [tex]KCl[/tex] salt bridge:
So, an Fe electrode in 1.0 M [tex]FeCl_2[/tex] solution and a [tex]Sn[/tex] electrode in 1.0 M [tex]Sn(NO_3)_2[/tex]solution, the Fe electrode serves as the anode, while the Sn electrode serves as the cathode.
The [tex]Sn^2^+[/tex] ions in the aqueous solution of [tex]Sn(NO_3)_2[/tex] will accept electrons from the Sn cathode and become deposited as neutral Sn atoms. At the anode, neutral Fe atoms will dissolve into the [tex]FeCl_2[/tex]solution depositing their electrons at the anode, thereby losing mass.

Therefore the correct option is: (B) The tin electrode gains mass and the tin electrode is the cathode.

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