NEET Chemistry Redox Reactions Questions Solved

Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half cell reactions and their standard potential are given below

MnO4-(aq) + 8H+(aq) + 5e- Mn2+(aq) + 4H2O(l);E°=1051V

Cr2O72-(aq) +14H+(aq) + 6e 2Cr3+(aq) + 7H2O(l);E°=1.38V

Fe3+(aq) + e- Fe2+(aq);E°=0.77V

Cl2(g) + 2e- 2Cl-(aq); E°= 1.40V

Identify the only incorrect statement regarding the quantitative estimation of aqueous Fe(NO3)2

1. MnO4- can be used in aqueous HCl

2. Cr2O72- can be used in aqueous HCl

3. MnM42- can be used in aqueous H2SO4

4.  Cr2O72- can be used in aqueous H2SO4

(1) From reduction electrode potential values,  MnO4- can oxidise Cl- as well as Fe2+. Hence,  MnO4- cannot be used in aqueous HCl for quantitative estimation of Fe(NO3)2.

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