Question

The correct order of $E^0_{M^{2+}/M}$ 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

Answer 1

${ \frac{ \frac{ {?}^{?} \times \frac{?}{?} \times \frac{?}{?} }{?} }{?} }^{2}$