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  1. Which of the following is not permissible arrangement of electrons in an atom?
  2. The spectrum of He is expected to be similar to
  3. The reagent with which both acetaldehyde and acetone react easily is
  4. Calculate the energy in joule corresponding to light of wavelength 45nm
  5. Equal volumes of 0.1 M AgNO₃ and 0.2 M NaCl are mixed