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  1. In which of the following compounds manganese has oxidation number equal
  2. The de-Broglie wavelength associated with a ball of mass 1kg having kinetic energy
  3. The number of moles of KMnO₄ that will be needed to react with one mole of
  4. Perchloric acid is prepared by the action of concentrated sulphuric acid on
  5. Oxidation numbers of P in PO₄³⁻, of S in SO₄²⁻ and that of Cr in Cr₂O₇²⁻