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JEE Advanced 2020 Concept Recapitulation Test 3 Paper 2

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A quantity of 25mL of solution containing both Fe2* and Fe3+ ions is titrated with 25mL of 0.0200M KMnO42n dilute H2SO4. As a result all the Fe2* ions are oxidiced to Fe3* ions. Next 25mL of the original solution is treated with zn metal. Finally, the solution requires 40mL of the same KMnO4 solution for oxidation to Fe3*. MnO4−+5Feir+8H*⟶Mn2+5Fe2t+4H2O
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