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  1. Reaction of solid KMnO₄ ith conc.H₂SO₄ produces manganese heptoxide (Mn₂O₇) in
  2. Equivalent conductances of Ba²⁺ and Cl⁻ ions are 127 and 76 ohm⁻¹ cm⁻¹ eq⁻¹
  3. In Lassaigne’s test a violet colour obtained indicates the presence of
  4. Which of the following species has four lone pairs of electrons?
  5. The electron configuration of an element is 1s²,2s²,2p⁶,3s²,3p⁶,3d⁵,4s¹