ElectrochemistryHard
Question
Peroxodisulphate salts (e.g., Na2S2O8) are storng oxidizing agents used as bleaching agents for fats, oils, etc.
Given:
O2(g) + 4H+ (aq) + 4e- H2O(l) E- = 2.01 V
S2O82-(aq) + 2e- 2SO42-(aq) E- = 2.01 V
Which of the following statements is (are) correct ?
Given:
O2(g) + 4H+ (aq) + 4e- H2O(l) E- = 2.01 V
S2O82-(aq) + 2e- 2SO42-(aq) E- = 2.01 V
Which of the following statements is (are) correct ?
Options
A.Oxygen gas can oxidize sulphate ion to per-oxo-disulphate ion (S2O82-) in acidic solution.
B. O2(g) is reduced to water.
C.Water is oxidized to O2.
D.S2O82- ions are reduced to SO42- ions.
Solution
create a cell with required cell reaction.
O2 + SO42- → S2O82- + H2O; E-cell = 1.23 - 2.01 < 0
⇒ Spontaneous cell reaction: (reverse reaction), i.e.,
H2O + S2P82- → O2 + SO42-
O2 + SO42- → S2O82- + H2O; E-cell = 1.23 - 2.01 < 0
⇒ Spontaneous cell reaction: (reverse reaction), i.e.,
H2O + S2P82- → O2 + SO42-
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