Redox reaction play a pivotal role in chemistry and biology. The values of standard redox…

Chemistry · JEE Advanced · NTA ExamsElectrochemistry


Redox reaction play a pivotal role in chemistry and biology. The values of standard redox potential (Eº) of two half-cell reactions decide which way the reaction is expected to proceed. A simple example is a Daniell 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 Eº (V with respect to normal hydrogen electrode) values. (2007)
I2 + 2e→ 2Ι Eº = 0.54
Cl2 + 2e → 2Cl Eº = 1.36
Mn3+ + e → Mn2+ Eº = 1.50
Fe3+ + e → Fe2+ Eº = 0.77
O2 + 4H+ + 4e → 2H2O Eº = 1.23
Among the following, identify the correct statement
  1. chloride ion is oxidised by O2
  2. Fe2+ is oxidised by iodine
  3. iodide ion is oxidised by chlorine
  4. Mn2+ is oxidised by chlorine

Answer

(C) iodide ion is oxidised by chlorine

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