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  1. Which of the following is not an actinide
  2. p-type silicon is formed by adding a minute amount of an element with
  3. If 10 cm³ solution of H₂O₂ ,on decomposition gives 150 cm³ of O₂
  4. The energy of an electron in the nth Bohr orbit of hydrogen atom is
  5. An important product in the ozone depletion by chlorofluorocarbons is