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JEE Main 202125 JulyEvening Shift
Exam
JEE Main
Year
2021
Date
25 July
Shift
Evening Shift
Subject
Chemistry
Chapter
Redox Reactions

JEE Main 2021 · 25 July · Evening Shift · Chemistry · Redox Reactions

Identify the process in which change in the oxidation state is five...

Identify the process in which change in the oxidation state is five :

Options

  1. ACr2O72−→2Cr3+{Cr}_{2}{O}_{7}^{2 -} \to 2{Cr}^{3 +}
  2. BMnO4−→Mn2+{MnO}_{4}^{-} \to {Mn}^{2 +}
  3. CCrO42−→Cr3+{CrO}_{4}^{2 -} \to {Cr}^{3 +}
  4. DC2O42−→2CO2{C}_{2}{O}_{4}^{2 -} \to 2{CO}_{2}

Correct answer

B. MnO4−→Mn2+{MnO}_{4}^{-} \to {Mn}^{2 +}

Step-by-step solution

MnO4−+5e→Mn+2{MnO}_{4}^{-} + 5e \to {Mn}^{+ 2}
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