Redox reactions play a pivotal role in chemistry and biology. The values of standard redox potential (E°) of two half-cell reactions decide which way the reaction is expected to proceed. A simple example is a Daniel cell in which zinc goes into solution and copper gets deposited. Given below are a set of half-cell reactions (acidic medium) along with their E° (V with respect to normal hydrogen electrode) values.
Using this data obtain the correct explanations to Questions 22-24.
I 2 + 2e – → 2I – E° = 0.54
Cl 2 + 2e – → 2Cl – E° = 1.36;
Mn 3+ + e – → Mn 2+ E° = 1.50
Fe 3+ + e – → Fe 2+ E° = 0.77
O 2 + 4H + + 4e – → 2H 2 O E° = 1.23
(i)Among the following, identify the correct statement :
Text Solution
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(i)
Sol. Iodide ion is oxidised by chlorine
(ii)
Sol. Mn 3+ oxidises H 2 O to O 2
(iii)
Sol. Fe 4 [Fe(CN) 6 ] 3
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