1. The color of KMnO4 disappear when oxalic acid is added to its solution in acidic medium.Explain.
  2. The halides of transition elements become more covalent with increasing oxidation state of the metal.Why?
  3. The first ionization enthalpy of Cr is lower than that of Zn.Why?
Although F is more electronegative than oxygen,but the ability of oxygen to stabilise higher oxidation state exceeds tht of fluorine.Why?

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