Question

Select the correct statement if:
$E_{M{g}^{2+}/Mg}^0=-2.4V,E_{S{n}^{4+}/S{n}^{2+}}^0=0.1V,E_{Mn{O}_4^{-},H^{+}/M{n}^{2+}}^0=1.5V,E_{I_2/I^{-}}^0=0.5V$

• A. $Mn{O}_4^{-}$ is the strongest oxidizing agent and Mg is the strongest reducing agent.
• B. $S{n}^{4+}+2I^{-}\to S^{2+}+I_2$ is a spontaneous reaction.
• C. $M{g}^{2+}+S{n}^{2+}\to Mg+S{n}^{4+}$ is a spontaneous reaction.
• D. Here, weakest oxidizing agent is $S{n}^{4+}$ and weakest reducing agent is $M{n}^{2+}$.

Answer 1

Answer: (A)

$Mn{O}_4^{-}$ is the strongest oxidizing agent and Mg is the strongest reducing agent.

(A) $E_{Mn{O}_4^{-},H^{+}/M{n}^{2+}}^0=1.5$ V is most positive. Hence, $Mn{O}_4^{-},$ is the strongest oxidizing agent.

$E_{M{g}^{2+}/Mg}^0=-2.4$ V is most negative. Hence, Mg is the strongest reducing agent.

Hence, the statement (A) is correct.

(B) $S{n}^{4+}+2I^{-}\to S^{2+}+I_2$ is a non spontaneous reaction.
Hence, the statement (B) is incorrect.

(C) $M{g}^{2+}+S{n}^{2+}\to Mg+S{n}^{4+}$ is a non spontaneous reaction.
Hence, the statement (C) is incorrect.

(D) Here, the weakest oxidizing agent is $M{g}^{2+}$ and the weakest reducing agent is $M{n}^{2+.}$.
Hence, the statement (D) is incorrect.