Question

$E{}^{\circ }$ for $M{g}^{2+}\text{/}Mg=-2.37V,$ $Z{n}^{+2}/Zn$ $=-0.76V$ and $F{e}^{2+}/Fe=-0.44V.$ Which statement is correct?

• A. Zn reduces $F{e}^{2+}$
• B. Zn reduces $M{g}^{2+}$
• C. Mg oxidises $Fe$
• D. Zn oxidises $Fe$

Answer 1

Answer: (A)

Higher the negative value of reduction potential, higher will be the reducing power. Hence, Mg reduces both $Z{n}^{2+}$ and $F{e}^{2+}$ . Zn can reduce $F{e}^{2+}$ but not $M{g}^{2+}$ . Similarly $F{e}^{2+}$ can oxidise $Zn$ and $Mg$ both.