The total number of Faradays required to oxidize the following separately`:`
a. 1 mol of `S_(2)O_(3)^(2-)` in acid medium
b. 1 Equivalent of `S_(2)O_(3)^(2-)` in acid medium
c. 1 mol of `S_(2)O_(3)^(2-)` in basic medium.

Answer

10

Explanation

`a. S_(2)O_(3)^(2-)rarr (1)/(2)S_(4)O_(6)^(2-)+e^(-)[1F]`
`b. S_(2)O_(3)^(2-)+5H_(2)Orarr2HSO_(4)^(c-)+8H^(o+)+8e^(-)`
`[1 mol =8F` but `1Eq=1F]`
`c. S_(2)O_(3)^(2-) +10overset(c-)(O)Hrarr 2SO_(4)^(2-)+5H_(2)O+8e^(-)`
`[1mol=8F]`
Total Faradays in `(i),(ii), `and `(iii)=1+1+8=10F`