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The E°M^3+/ M^2+ values for Cr, Mn, Fe and Co are – 0.41,

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asked Mar 30, 2018 in Chemistry by paayal (26,720 points) ● 4 ● 6 ● 11

The E°M3+/ M2+  values for Cr, Mn, Fe and Co are – 0.41, +1.57, 0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?

(a) Cr 

(b) Mn

(c) Fe 

(d) Co.

1 Answer

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answered Mar 30, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Apr 1, 2018 by Vikash Kumar
 
Best answer

(a) : Cr2+ | Cr3+ = +0.41V
Mn2+ | Mn3+ = –1.57V
Fe2+ | Fe3+ = – 0.77V
Co2+ | Co3+ = – 1.97V
More is the value of oxidation potential more is the tendency to get oxidised. As Cr will have maximum oxidation potential value,therefore its oxidation will be easiest.

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