MCQ
Identify correct reactivity order for ${{S}_{{{N}^{2}}}}$ reaction


- A$i > ii > iii$
- B$ii > iii > i$
- C$i > iii > ii$
- ✓$iii > ii > i$

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$Z{n^{2 + }} + 2{e^ - } \to Zn$ ; $E = - 7.62\,\,V,$
$F{e^{2 + }} + 2{e^ - } \to Fe$ ; $E = - 7.81\,\,V$
The emf of the cell $F{e^{2 + }} + Zn \to Z{n^{2 + }} + Fe$ is ............ $\mathrm{V}$