Question

In $3d$ series, the metal having the highest $M^{2+}/M$ standard electrode potential is

• A. Cr
• B. Fe
• C. Cu
• D. Zn

Answer 1

Answer: (A)

Cr

Answer 2

Metal $E° M^{2+}/M$

$Cr ^–\;0.90 \;V$

$Fe ^–\;0.44 \;V$

$Cu ^+\; 0.34 \;V$

$Zn (–0.76 \;V)$

The metal having highest $E° M^{2+}/M$ standard reduction potential is $Cu$.