The shape of MnO​4 - ion and the hybridisation of Mn in MnO4 - ion is ?
  1. tetrahedral , sp​3
  2. tetrahedral , d3s
  3. square planar , dsp2
  4. square planar , sp​3

MnO4- has a tetrahedral geometry and it uses sd3 orbitals. That is Mn uses 3dxy, 3dyz, 3dzx orbitals and 4s orbitals to bond with four oxygen atom. 

Thus option 2 is correct. 

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