Chemistry - Redox Reactions Question with Solution | TestHub
ChemistryRedox ReactionsBalancing of Redox ReactionsMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
In the presence of fluoride ion, Mn²⁺ can be titrated with MnO₄⁻, both reactants being converted to a complex of Mn(III). A 0.458 g of sample containing Mn₃O₄ was dissolved and all manganese was converted to Mn²⁺. Titration in the presence of fluoride ion consumed 30.0 ml of KMnO₄ that was 0.125 N against oxalate. (Mn = 55)
The correct balanced reaction, assuming that the complex is MnF₄⁻, is
Options:
Answer:
C
Solution:
Mn²⁺ Mn(III) loses 1 e⁻ each; MnO₄⁻ Mn(III) gains 4 e⁻, so 4 Mn²⁺ per MnO₄⁻. Balancing charge and atoms with 8H⁺/4H₂O and adding 20F⁻ to complex all 5 Mn(III) as MnF₄⁻ gives 4Mn²⁺ + MnO₄⁻ + 8H⁺ + 20F⁻ 5MnF₄⁻ + 4H₂O, matching (c).
Stream:JEESubject:ChemistryTopic:Redox ReactionsSubtopic:Balancing of Redox Reactions
⏱ 2mℹ️ Source: QB
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