K2Cr2O7 and KMnO4
- In the neutral or faintly alkaline medium, KMnO_4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from Answer: 2. +7 to +4 Key idea: in neutral or weakly alkaline medium permanganate is reduced to MnO₂ . 2MnO₄^-+H₂O+I^-→2MnO₂+2OH^-+IO₃^- . Mn... 1
- The manganate and permanganate ions are tetrahedral, due to : Answer: 1. The π -bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese In MnO₄^- and mathrmMnO₄²⁻ , Mn uses sp³ hyb... 1
- Which one of the following statements is correct when SO_2 is passed through acidified K_2Cr_2O_7 solution ? Answer: 4. Green Cr₂(SO₄)₃ is formed. Key idea: SO₂ is a reducing agent and acidified dichromate is an oxidising agent. mathrmCr₂O₇²⁻+3SO₂+2... 1