Question

The standard reduction potentials for $C{u}^{2+}/Cu;Z{n}^{2+}/Zn$; $L{i}^{+}/Li;A{g}^{+}/Ag$ and $H^{+}/H_2$ are $+0.34V,-0.762V,-3.05V,+0.80V$ and $0.00V$ respectively. Choose the strongest reducing agent among the following

• A. $Zn$
• B. $H_2$
• C. $Ag$
• D. $Li$

Answer 1

Answer: (D)

More the negative reduction potential, more is the tendency to lose electron. The reducing power increases as the standard reduction potential becomes more and more negative.
Thus, $Li$ is the strongest reducing agent as the standard reduction potential of $L{i}^{+}/Li$ is most negative, $-3.05V$.