The standard reduction potentials (in $V$) of a few metal ion/metal electrodes are given below: $Cr^{3+}/Cr = -0.74$; $Cu^{2+}/Cu = +0.34$; $Pb^{2+}/Pb = -0.13$; $Ag^{+}/Ag = +0.8$. The reducing strength of the metals follows the order:
- A$Ag > Cu > Pb > Cr$
- B$Cr > Pb > Cu > Ag$
- C$Pb > Cr > Ag > Cu$
- D$Cr > Ag > Cu > Pb$
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