Question

Out of $Cu,Ag,Fe$ and $Zn$, the metal which can displace all others from their salt solution is:

• A. $Ag$
• B. $Cu$
• C. $Fe$
• D. $Zn$

Answer 1

Answer: (D)

$Zn$

This answer can be explained by Reduction potential values:

$Z{n}^{+2}+2e^{-}⟶Zn$ $[-0.76]$

$A{g}^{+}+e^{-}⟶Ag$ $\left[0.22\right]$

$C{u}^{+}+e^{-}⟶Cu$ $\left[0.52\right]$

$F{e}^{+3}+e^{-}⟶F{e}^{+2}$ $\left[0.77\right]$

As the reduction potential for $Zn$ is low it can replace that element from their compound state for which their reduction potential is above than that.