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Question:
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Using the standard electrode potentials given below identify the correct statements from the following.
$$
\begin{aligned}
\mathrm{Fe}^{2+}+2 e^{-} \longrightarrow \mathrm{Fe} ; E^{\circ} & =-0.44 \mathrm{~V} \\
\mathrm{Cu}^{2+}+2 e^{-} \longrightarrow \mathrm{Cu} ; E^{\circ} & =+0.34 \mathrm{~V} \\
\mathrm{Ag}^{+}+e^{-} \longrightarrow \mathrm{Ag} ; E^{\circ} & =+0.80 \mathrm{~V}
\end{aligned}
$$
(i) Copper can displace iron from $\mathrm{FeSO}_4$ solution.
(ii) Iron can displace copper from $\mathrm{CuSO}_4$ solution.
(iii) Silver can displace copper from $\mathrm{CuSO}_4$ solution.
(iv) Iron can displace silver from $\mathrm{AgNO}_3$ solution.
Options:
$$
\begin{aligned}
\mathrm{Fe}^{2+}+2 e^{-} \longrightarrow \mathrm{Fe} ; E^{\circ} & =-0.44 \mathrm{~V} \\
\mathrm{Cu}^{2+}+2 e^{-} \longrightarrow \mathrm{Cu} ; E^{\circ} & =+0.34 \mathrm{~V} \\
\mathrm{Ag}^{+}+e^{-} \longrightarrow \mathrm{Ag} ; E^{\circ} & =+0.80 \mathrm{~V}
\end{aligned}
$$
(i) Copper can displace iron from $\mathrm{FeSO}_4$ solution.
(ii) Iron can displace copper from $\mathrm{CuSO}_4$ solution.
(iii) Silver can displace copper from $\mathrm{CuSO}_4$ solution.
(iv) Iron can displace silver from $\mathrm{AgNO}_3$ solution.
Solution:
1204 Upvotes
Verified Answer
The correct answer is:
(ii), (iv)
$$
\begin{gathered}
\mathrm{Fe}^{2+}+2 e^{-} \longrightarrow \mathrm{Fe} ; E^{\circ}=-0.44 \\
\mathrm{Cu}^{2+}+2 e^{-} \longrightarrow \mathrm{Cu} ; E^{\circ}=+0.34 \\
\mathrm{Ag}+1 e^{-} \longrightarrow \mathrm{Ag} ; E^{\circ}=+0.80
\end{gathered}
$$
If a metal have negative electrode potential than metal easily displace, other metal, i.e. Fe can displace $\mathrm{Cu}$ and $\mathrm{Ag}$.
\begin{gathered}
\mathrm{Fe}^{2+}+2 e^{-} \longrightarrow \mathrm{Fe} ; E^{\circ}=-0.44 \\
\mathrm{Cu}^{2+}+2 e^{-} \longrightarrow \mathrm{Cu} ; E^{\circ}=+0.34 \\
\mathrm{Ag}+1 e^{-} \longrightarrow \mathrm{Ag} ; E^{\circ}=+0.80
\end{gathered}
$$
If a metal have negative electrode potential than metal easily displace, other metal, i.e. Fe can displace $\mathrm{Cu}$ and $\mathrm{Ag}$.
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