The standard reduction potentials for

Question:

The standard reduction potentials for $\mathrm{Zn}^{2+} / \mathrm{Zn}, \mathrm{Ni}^{2+} / \mathrm{Ni}$ and $\mathrm{Fe}^{2+} / \mathrm{Fe}$ are $-0.76,-0.23$ and $-0.44 \mathrm{~V}$ respectively. The reaction $\mathrm{X}+\mathrm{Y}^{+2} \rightarrow \mathrm{X}^{2+}+\mathrm{Y}$ will be spontaneous when

  1. X = Zn, Y = Ni 

  2.  X = Ni, Y = Fe

  3. X = Ni, Y = Zn

  4. X = Fe, Y = Zn


Correct Option: 1

Solution:

For spontaneous reaction $\mathrm{E}^{\circ}>0$ so (A)

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