The correct order of E0M2+/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is

Question

The correct order of E0M2+/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is (A) Mn > Cr > Fe > Co (B) Cr > Fe > Mn > Co (C) Fe > Mn > Cr > Co (D) Cr > Mn > Fe > Co

Tardigrade Admin · Accepted Answer

Usually across the first transition series, the negative values for standard electrode potential decrease except for Mn due to stable

d 5

configuration.
The electronic configuration of various elements in

M n^{2 +}

state is:

C r - [A r] 3 d^{4}

M n - C r - [A r] 3 d^{5}

-half filled- most stable.

F e - C r - [A r] 3 d^{6}

C o - C r - [A r] 3 d^{7}

So, based on above facts the correct order is:

M n > C r > F e > C o .

Q. The correct order of $E_{M^{2 +} / M}^{0}$ values with negative sign for the four successive elements $C r, M n, F e$ and $C o$ is

$M n > C r > F e > C o$

$C r > F e > M n > C o$

$F e > M n > C r > C o$

$C r > M n > F e > C o$

Q. The correct order of EM2+/M0​ values with negative sign for the four successive elements Cr,Mn,Fe and Co is

Mn>Cr>Fe>Co

Cr>Fe>Mn>Co

Fe>Mn>Cr>Co

Cr>Mn>Fe>Co

Q. The correct order of $E_{M^{2 +} / M}^{0}$ values with negative sign for the four successive elements $C r, M n, F e$ and $C o$ is

$M n > C r > F e > C o$

$C r > F e > M n > C o$

$F e > M n > C r > C o$

$C r > M n > F e > C o$