Question

For the electrochemical cell, $M\left|M^{+}\right|\left|X^{-}\right|X,E^{\circ }\left(M^{+}/M\right)=0.44V$ and $E^{\circ }\left(X/X^{-}\right)=0.33V.$
From this data, one can deduce that

• A. $M+X\to M^{+}+X^{-}$ is the spontaneous reaction
• B. $M^{+}+X^{-}\to M+X$ is the spontaneous reaction
• C. $E_{\text{cell}}=0.77V$
• D. $E_{\text{cell}}=-0.77V$

Answer 1

Answer: (B)

The spontaneous cell reaction is
$X^{-}+M^{+}⟶M+X;E^{\circ }=0.11V$