The standard reduction potentials for Zn2+ / Zn, Ni2+ / Ni, and Fe2+ / Fe are –0.76, –0.23 and 0.44 V respectively. The reaction X + Y2+ \overset{}{\rightarrow} X2+ + Y will be spontaneous when :

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Chemistry

EMF Calculation and Galvanic Cell

Question

The standard reduction potentials for

Zn²⁺ / Zn, Ni²⁺ / Ni, and Fe²⁺ / Fe are –0.76, –0.23 and 0.44 V respectively. The reaction

X + Y²⁺ $\overset{}{\to}$ X²⁺ + Y will be spontaneous when :

X = Ni, Y = Fe

X = Ni, Y = Zn

X = Zn, Y = Ni

X = Fe, Y = Zn

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E°_Y > E°_X

Hence, Y = Ni and X = Zn