The standard reduction potential for F e^ 2 + /Fe and S n^ 2 + /S… - Vidyadip

MCQ

The standard reduction potential for $F{e^{2 + }}/Fe$ and $S{n^{2 + }}/Sn$ electrodes are $ - 0.44$ and $ - 0.14$ volt respectively. For the given cell reaction $F{e^{2 + }} + Sn\, \to Fe + S{n^{2 + }}$, the standard EMF is ...............$\mathrm{V}$

A
$+ 0.30$
B
$-0.58 $
C
$+ 0.58 $
✓
$-0.30$

✓

Answer

Correct option: D.

$-0.30$

d
(d)For the cell reaction, $Fe$ acts as cathode and $Sn$ as anode. Hence,

$E_{cell}^o = E_{{\rm{cathode}}}^o - E_{{\rm{anode}}}^o$ $= -0.44 -(-0.14)= -0.30\,V$

The negative $EMF$ suggests that the reaction goes spontaneously in reversed direction.

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