Question

For the four successive transition elements $(Cr, Mn, Fe$ and $Co)$ , the stability of $+ 2$ oxidation state will be there in which of the following order? (At. no. $Cr = 24, Mn = 25, Fe = 26,Co = 27$ )

• A. Fe > Mn > Co > Cr
• B. Co > Mn > Fe > C
• C. Cr > Mn > Co > Fe
• D. Mn > Fe > Cr > Co

Answer 1

Answer: (D)

Mn > Fe > Cr > Co

Answer 2

On the basis electrode potential, the correct order is

$Mn > Fe > Cr > Co$