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JEE Advanced2007ChemistryRedox ReactionsActual

Paragraph: Redox reaction 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) v

Options

  1. AO ₂ oxidises Mn ²⁺ to Mn ³⁺
  2. BO ₂ oxidises both Mn ²⁺ and Fe ²⁺ to Fe ³⁺
  3. CFe ³⁺ oxidises H ₂ O to O ₂
  4. DMn ³⁺ oxidises H ₂ O to O ₂

Correct answer

D. Mn ³⁺ oxidises H ₂ O to O ₂

Step-by-step solution

aligned & [ Mn ³⁺+e⁻ . . Mn ²⁺ ] 4 & 2 H ₂ O 4 H ⁺+ O ₂+4 e⁻ & 4 Mn ²⁺+2 H ₂ O 4 Mn ²⁺+4 H ⁺+ O ₂ & E_ cell ^ = 1.50-1.23=0.27 ~V & E_ cell ^ is + ve aligned

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