Question

The standard reduction potentials at 298 K for single electrodes are given below.

Electrode	electrode potential (volt)
${\text{Mg}}^{\text{2+}}\text{/Mg}$	$-\text{2}\text{.34}$
${\text{Zn}}^{\text{2+}}\text{/Zn}$	$-\text{0}\text{.76}$
${\text{Fe}}^{\text{2+}}\text{/Fe}$	$-\text{0}\text{.44}$

From this we can tell that

• A. Zn can reduce both $M{g}^{2+}$ and $F{e}^{2+}$
• B. Fe can reduce both $M{g}^{2+}$ and $Z{n}^{2+}$
• C. Mg can reduce both $Z{n}^{2+}$ and $F{e}^{2+}$
• D. Mg can reduce $Z{n}^{2+}$ but not $F{e}^{2+}$

Answer 1

Answer: (C)

Metals with lower SRP can displace the metal with higher SRP from their solutions. Mg with lower $SRP(-2.34)$ can reduce both $Z{n}^{2+}(-0.76)$ and $F{e}^{2+}(-0.44)$.