(a) Arrrange A,B,C and D in order of incresing electrode potential in the electrochemical series if
(i) `A+B^(+)rarrA^(+)+B, (ii) B +D^(+) rarr B^(+)+D`
(iii) `B+C^(+)rarrB^(+)+C, (iv) C^(+)+Drarr` NO reaction
(b) on the basis of the above data predict which of the following reaction will ocur
(i) `A+C^(+) rarrA^(+)+C, (ii) A^(+)+D rarrA+D^(+)`

Explanation

(a) In the electrochemical series the atoms or species are arranged in order of their decreasing electrode potential
(i) since B is reduced by A therefore B has higher electrode potential than A
(ii) since D is reduced by B therefore D has higher electrode potential than B
(iii) Since C is reduced by B therefore C has higher electrode potential than B
(iv) since there is not reaction between `C^(+)` and D i.e C is not reduced by D therefore elecrode potential of the four elements decrease in the order `D gt C gt B gt A`
(b) (i) since electrode potential of C is higher than that of A therefore `C^(+)` can be easily reduced by A reacton (i) will occur
(ii) since electrode potential of D is higher than that of A therefore `A^(+)` cannot be reduced of by D i.e reaction (ii) wil not occur