A balanced equation that represents an overall cell reactionis shown. Choose the

Question

A balanced equation that represents an overall cell reactionis shown. Choose the cell notation which corresponds to theelectrochemical cell that is described by this equation.
St. Red. Pot. (V) Cr3+/Cr2+ -0.50 Ni2+/Ni -0.23

2Cr2+(aq) + Ni2+(aq) 2Cr3+(aq) + Ni(s)

Pt(s) l Cr2+(aq), Cr3+(aq)ll Ni2+(aq) l Ni(s) Pt(s) l Cr2+(aq), Cr3+(aq)ll Ni2+(aq), Ni(s) Ni(s) l Ni2+(aq) llCr2+(aq), Cr3+(aq) l Pt(s) Pt(s) l Cr2+(aq), Cr3+(aq)ll Ni2+(aq) l Pt(s) A balanced equation that represents an overall cell reactionis shown. Choose the cell notation which corresponds to theelectrochemical cell that is described by this equation.
St. Red. Pot. (V) Cr3+/Cr2+ -0.50 Ni2+/Ni -0.23

2Cr2+(aq) + Ni2+(aq) 2Cr3+(aq) + Ni(s)

St. Red. Pot. (V) Cr3+/Cr2+ -0.50 Ni2+/Ni -0.23

Explanation / Answer

In the above reaction oxidation half reaction:                                                                       2Cr2+(aq) --------> 2Cr3+(aq) +2e-                                 Reduction half reaction: Ni2+(aq)+2e- --------> Ni(s)
Out of the two Cr3+/Cr2+ is havinghigher reaction potential . So it is the best reducing agent . Thatmeans it itself gets oxidised. So the cell notation can be written as Pt(s) lCr2+(aq), Cr3+(aq) ll Ni2+(aq) lNi(s)                                 Reduction half reaction: Ni2+(aq)+2e- --------> Ni(s)
Out of the two Cr3+/Cr2+ is havinghigher reaction potential . So it is the best reducing agent . Thatmeans it itself gets oxidised. So the cell notation can be written as Pt(s) lCr2+(aq), Cr3+(aq) ll Ni2+(aq) lNi(s)

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