Question

Peroxodisulphate salts, `(e.g., Na_(2)S_(2)O_(8))` are strong oxidizing agents used be bleaching agents for fats, oils, ets.
Given `:`
`O_(2)(g)+4H^(o+)(aq)+4e^(-)rarr 2H_(2)O(l)" "E^(c-)=1.23V`
`S_(2)O_(8)^(2-)(aq)+2e^(-)rarr 2SO_(4)^(2-)(aq)" "E^(C-)=2.01V`
Which of the following statement is `(` are `)` correct ?
A. Oxygen gas can oxidize sulphate ion to per`-` oxo disulphate ion `(S_(2)O_(8)^(2-))` in acidic solution.
B. `O_(2)(g)` is reduced to water.
C. Water is oxidized to `O_(2)`
D. `S_(2)O_(8)^(2-)` ions are reduced to `SO_(4)^(2-)` ions.

Answer 1

Correct Answer - c,d
Create a cell with required cell reaction `:`
`O_(2)+SO_(4)^(2-)rarr S_(2)O_(8)^(2-)+H_(2)O, E^(c-)._(cell)=1.23-2.01lt0`
`implies ` Spontaneous cell reaction `: (` reverse reaction `),i.e.,`
`H_(2)O+S_(2)O_(8)^(2-) rarr O_(2)+SO_(4)^(2-)`