The correct order of E^{0}_{M^{2+}/M}values with negative sign for the four successive elements

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

 

Answers (1)

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.

 

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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.

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