# The correct order of $\dpi{100} E^{0}_{M^{2+}/M}$values with negative sign for the four successive elements$\dpi{100} Cr ,Mn,Fe \: and \: Co$ is Option 1) $Cr > Mn> Fe > Co$ Option 2) $Mn> Cr > Fe > Co$ Option 3) $Cr > Fe >Mn >Co$ Option 4) $Fe >Mn >Cr >Co$

As we learnt in

M2+ / M standard electrode potential -

The thermochemical parameters related to the transformation of the solid metal atoms to M2+ ions in solution and their standard electrode potential E- shown in fig.

-

The correct order of $E^{\circ}_{M^{2+}/M}$ value with negative sign for the four successive elements $Mn> Cr> > Fe> Co$

Option 1)

$Cr > Mn> Fe > Co$

This option is incorrect.

Option 2)

$Mn> Cr > Fe > Co$

This option is correct.

Option 3)

$Cr > Fe >Mn >Co$

This option is incorrect.

Option 4)

$Fe >Mn >Cr >Co$

This option is incorrect.

### Preparation Products

##### JEE Main Rank Booster 2021

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 13999/- ₹ 9999/-
##### Knockout JEE Main April 2021 (Subscription)

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 4999/-
##### Knockout JEE Main April 2021

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 22999/- ₹ 14999/-
##### Knockout JEE Main April 2022

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 34999/- ₹ 24999/-