The correct order of E°M^2+/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is
The correct order of E°M2+/M values with negative sign for the four successive elements Cr, Mn, Fe and Co is
(a) Cr > Mn > Fe > Co
(b) Mn > Cr > Fe > Co
(c) Cr > Fe > Mn > Co
(d) Fe > Mn > Cr > Co
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(b) : E°Mn2+/Mn = – 1.18V
E°Cr2+/Cr = – 0.91V
E°Fe2+/Fe = – 0.44V
E°Co2+/Co = – 0.28V
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