Structure of Atom (Quiz)

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Q.1 Which of the following is false?
  The d orbitals are no more degenerate in the presence of a magnetic field
  The spin number was introduced to explain the splitting of spectral lines of hydrogen atom in the presence of a magnetic field
  Pauli exclusion exclusion principle is followed by fermions which have half integral spins.
  The energy of an orbital in an atom remains the same with increase in the positive charge in its nucleus.