MCQ
Considering the above reactions, the compound $'A'$ and compound $'B'$ respectively are


- A

- B

- ✓

- D







Whereas in $AgCN; \;Ag - C$ has covalent bond
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(At. nos. $Mn = 25, Fe = 26, Co = 27, Ni = 28$)

$E_{{A^{3 + }}/A}^o = 1.50\,\,V\,,$ $E_{{B^{2 + }}/B}^o = 0.3\,\,V,$
$E_{{C^{3 + }}/C}^o = - \,0.74\,\,V,$ $E_{{D^{2 + }}/D}^o = - \,2.37\,\,V.$
The correct sequence in which the various metals are deposited at the cathode is